Publications 2018

Hewitt S, Aasheim ET, Søvik TT, Jahnsen J, Kristinsson J, Eriksen EF, Mala T (2018)
Relationships of serum 25-hydroxyvitamin D, ionized calcium and parathyroid hormone after obesity surgery
Clin Endocrinol (Oxf), 88 (3), 372-379
DOI 10.1111/cen.13531, PubMed 29235126

Werling M, Fändriks L, Olbers T, Mala T, Kristinsson J, Stenlöf K, Wallenius V, Docherty NG, le Roux CW (2018)
Biliopancreatic Diversion is associated with greater increases in energy expenditure than Roux-en-Y Gastric Bypass
PLoS One, 13 (4), e0194538
DOI 10.1371/journal.pone.0194538, PubMed 29617391

Publications 2017

Ebbesen MS, Nygaard U, Rosthøj S, Sørensen D, Nersting J, Vettenranta K, Wesenberg F, Kristinsson J, Harila-Saari A, Schmiegelow K (2017)
Hepatotoxicity During Maintenance Therapy and Prognosis in Children With Acute Lymphoblastic Leukemia
J Pediatr Hematol Oncol, 39 (3), 161-166
DOI 10.1097/MPH.0000000000000733, PubMed 28060115

Høgestøl IK, Chahal-Kummen M, Eribe I, Brunborg C, Stubhaug A, Hewitt S, Kristinsson J, Mala T (2017)
Chronic Abdominal Pain and Symptoms 5 Years After Gastric Bypass for Morbid Obesity
Obes Surg, 27 (6), 1438-1445
DOI 10.1007/s11695-016-2499-z, PubMed 28028658

Mala T, Kristinsson J (2017)
Gastrointestinal symptoms after bariatric surgery-more focus needed
Surg Obes Relat Dis, 13 (7), 1251
DOI 10.1016/j.soard.2017.03.009, PubMed 28438495

Aasbrenn M, Høgestøl I, Eribe I, Kristinsson J, Lydersen S, Mala T, Farup PG (2017)
Prevalence and predictors of irritable bowel syndrome in patients with morbid obesity: a cross-sectional study
BMC Obes, 4, 22
DOI 10.1186/s40608-017-0159-z, PubMed 28680646

Publications 2016

Schmiegelow K, Nersting J, Nielsen SN, Heyman M, Wesenberg F, Kristinsson J, Vettenranta K, Schrøeder H, Weinshilboum R, Jensen KL, Grell K, Rosthoej S (2016)
Maintenance therapy of childhood acute lymphoblastic leukemia revisited-Should drug doses be adjusted by white blood cell, neutrophil, or lymphocyte counts?
Pediatr Blood Cancer, 63 (12), 2104-2111
DOI 10.1002/pbc.26139, PubMed 27447547

Publications 2015

Kristinsson J (2015)
The ASMBS textbook of bariatric surgery, vol 2, Integrated health
Tidsskr. Nor. Laegeforen., 135 (11), 1058

Svanevik M, Risstad H, Hofsø D, Schou CF, Solheim B, Søvik TT, Kristinsson J, Hjelmesæth J, Mala T, Sandbu R (2015)
Perioperative Outcomes of Proximal and Distal Gastric Bypass in Patients with BMI Ranged 50-60 kg/m(2)--A Double-Blind, Randomized Controlled Trial
Obes Surg, 25 (10), 1788-95
DOI 10.1007/s11695-015-1621-y, PubMed 25761943

Aaseth E, Fagerland MW, Aas AM, Hewitt S, Risstad H, Kristinsson J, Bøhmer T, Mala T, Aasheim ET (2015)
Vitamin concentrations 5 years after gastric bypass
Eur J Clin Nutr, 69 (11), 1249-55
DOI 10.1038/ejcn.2015.82, PubMed 26081488

Publications 2014

Hewitt S, Humerfelt S, Søvik TT, Aasheim ET, Risstad H, Kristinsson J, Mala T (2014)
Long-term improvements in pulmonary function 5 years after bariatric surgery
Obes Surg, 24 (5), 705-11
DOI 10.1007/s11695-013-1159-9, PubMed 24435516

Publications 2013

Hewitt S, Søvik TT, Aasheim ET, Kristinsson J, Jahnsen J, Birketvedt GS, Bøhmer T, Eriksen EF, Mala T (2013)
Secondary hyperparathyroidism, vitamin D sufficiency, and serum calcium 5 years after gastric bypass and duodenal switch
Obes Surg, 23 (3), 384-90
DOI 10.1007/s11695-012-0772-3, PubMed 23015268

Mala T, Kristinsson J (2013)
[Acute internal hernia following gastric bypass for morbid obesity]
Tidsskr Nor Laegeforen, 133 (6), 640-4
DOI 10.4045/tidsskr.12.1113, PubMed 23552158

Publications 2012

Mala T, Søvik TT, Schou CF, Kristinsson J (2012)
Blood clot obstruction of the jejunojejunostomy after laparoscopic gastric bypass
Surg Obes Relat Dis, 9 (2), 234-7
DOI 10.1016/j.soard.2011.12.014, PubMed 22421098

Søvik TT, Karlsson J, Aasheim ET, Fagerland MW, Björkman S, Engström M, Kristinsson J, Olbers T, Mala T (2012)
Gastrointestinal function and eating behavior after gastric bypass and duodenal switch
Surg Obes Relat Dis, 9 (5), 641-7
DOI 10.1016/j.soard.2012.06.006, PubMed 22951078

Publications 2011

Hofsø D, Aasheim ET, Søvik TT, Jakobsen GS, Johnson LK, Sandbu R, Aas AT, Kristinsson J, Hjelmesæth J (2011)
[Follow-up after bariatric surgery]
Tidsskr Nor Laegeforen, 131 (19), 1887-92
DOI 10.4045/tidsskr.10.1463, PubMed 21984294

Nesbakken A, Kristinsson J, Svindland A, Lunde OC (2011)
Endoscopic snare resection followed by laser ablation in the treatment of large, sessile rectal adenomas
Scand J Surg, 100 (2), 99-104
DOI 10.1177/145749691110000206, PubMed 21737385

Schou CF, Søvik TT, Aasheim ET, Kristinsson J, Mala T (2011)
[Treating morbid obesity with laparoscopic biliopancreatic diversion with duodenal switch]
Tidsskr Nor Laegeforen, 131 (19), 1882-6
DOI 10.4045/tidsskr.10.1164, PubMed 21984293

Søvik TT, Aasheim ET, Taha O, Engström M, Fagerland MW, Björkman S, Kristinsson J, Birkeland KI, Mala T, Olbers T (2011)
Weight loss, cardiovascular risk factors, and quality of life after gastric bypass and duodenal switch: a randomized trial
Ann Intern Med, 155 (5), 281-91
DOI 10.7326/0003-4819-155-5-201109060-00005, PubMed 21893621

Publications 2010

Schmiegelow K, Heyman M, Gustafsson G, Lausen B, Wesenberg F, Kristinsson J, Vettenranta K, Schroeder H, Forestier E, Rosthoej S, Nordic Society of Paediatric Haematology and Oncology (NOPHO) (2010)
The degree of myelosuppression during maintenance therapy of adolescents with B-lineage intermediate risk acute lymphoblastic leukemia predicts risk of relapse
Leukemia, 24 (4), 715-20
DOI 10.1038/leu.2009.303, PubMed 20130603

Søvik TT, Irandoust B, Birkeland KI, Aasheim ET, Schou CF, Kristinsson J, Mala T (2010)
[Type 2 diabetes and metabolic syndrome before and after gastric bypass]
Tidsskr Nor Laegeforen, 130 (13), 1347-50
DOI 10.4045/tidsskr.09.0935, PubMed 20596116

Søvik TT, Taha O, Aasheim ET, Engström M, Kristinsson J, Björkman S, Schou CF, Lönroth H, Mala T, Olbers T (2010)
Randomized clinical trial of laparoscopic gastric bypass versus laparoscopic duodenal switch for superobesity
Br J Surg, 97 (2), 160-6
DOI 10.1002/bjs.6802, PubMed 20035530

Publications 2009

Schmiegelow K, Al-Modhwahi I, Andersen MK, Behrendtz M, Forestier E, Hasle H, Heyman M, Kristinsson J, Nersting J, Nygaard R, Svendsen AL, Vettenranta K, Weinshilboum R, Nordic Society for Paediatric Haematology and Oncology (2009)
Methotrexate/6-mercaptopurine maintenance therapy influences the risk of a second malignant neoplasm after childhood acute lymphoblastic leukemia: results from the NOPHO ALL-92 study
Blood, 113 (24), 6077-84
DOI 10.1182/blood-2008-11-187880, PubMed 19224761

Schmiegelow K, Forestier E, Hellebostad M, Heyman M, Kristinsson J, Söderhäll S, Taskinen M, Nordic Society of Paediatric Haematology and Oncology (2009)
Long-term results of NOPHO ALL-92 and ALL-2000 studies of childhood acute lymphoblastic leukemia
Leukemia, 24 (2), 345-54
DOI 10.1038/leu.2009.251, PubMed 20010622

Schmiegelow K, Heyman M, Kristinsson J, Mogensen UB, Rosthøj S, Vettenranta K, Wesenberg F, Saarinen-Pihkala U, Nordic Society of Paediatric Haematology and Oncology (NOPHO) (2009)
Oral methotrexate/6-mercaptopurine may be superior to a multidrug LSA2L2 Maintenance therapy for higher risk childhood acute lymphoblastic leukemia: results from the NOPHO ALL-92 study
J Pediatr Hematol Oncol, 31 (6), 385-92
DOI 10.1097/MPH.0b013e3181a6e171, PubMed 19648786

Publications 2008

Schmiegelow K, Forestier E, Kristinsson J, Söderhäll S, Vettenranta K, Weinshilboum R, Wesenberg F, Nordic Society of Paediatric Haematology and Oncology (2008)
Thiopurine methyltransferase activity is related to the risk of relapse of childhood acute lymphoblastic leukemia: results from the NOPHO ALL-92 study
Leukemia, 23 (3), 557-64
DOI 10.1038/leu.2008.316, PubMed 18987654

Søvik TT, Aasheim ET, Kristinsson J, Schou CF, Diep LM, Nesbakken A, Mala T (2008)
Establishing laparoscopic Roux-en-Y gastric bypass: perioperative outcome and characteristics of the learning curve
Obes Surg, 19 (2), 158-165
DOI 10.1007/s11695-008-9584-x, PubMed 18566869

Publications 2007

Søvik TT, Aasheim ET, Kristinsson J, Schou CF, Nesbakken A, Mala T (2007)
[Surgical treatment of morbid obesity at a regional center]
Tidsskr Nor Laegeforen, 127 (1), 47-9
PubMed 17205090

Aasheim ET, Mala T, Søvik TT, Kristinsson J, Bøhmer T (2007)
[Surgical treatment of morbid obesity]
Tidsskr Nor Laegeforen, 127 (1), 38-42
PubMed 17205088

Publications 2003

Berntson L, Andersson Gäre B, Fasth A, Herlin T, Kristinsson J, Lahdenne P, Marhaug G, Nielsen S, Pelkonen P, Rygg M, Nordic Study Group (2003)
Incidence of juvenile idiopathic arthritis in the Nordic countries. A population based study with special reference to the validity of the ILAR and EULAR criteria
J Rheumatol, 30 (10), 2275-82
PubMed 14528529

Hjalgrim LL, Rostgaard K, Schmiegelow K, Söderhäll S, Kolmannskog S, Vettenranta K, Kristinsson J, Clausen N, Melbye M, Hjalgrim H, Gustafsson G (2003)
Age- and sex-specific incidence of childhood leukemia by immunophenotype in the Nordic countries
J Natl Cancer Inst, 95 (20), 1539-44
DOI 10.1093/jnci/djg064, PubMed 14559876

Schmiegelow K, Björk O, Glomstein A, Gustafsson G, Keiding N, Kristinsson J, Mäkipernaa A, Rosthøj S, Szumlanski C, Sørensen TM, Weinshilboum R (2003)
Intensification of mercaptopurine/methotrexate maintenance chemotherapy may increase the risk of relapse for some children with acute lymphoblastic leukemia
J Clin Oncol, 21 (7), 1332-9
DOI 10.1200/JCO.2003.04.039, PubMed 12663723

Publications 2002

Berntson L, Fasth A, Andersson-Gäre B, Herlin T, Kristinsson J, Lahdenne P, Marhaug G, Nielsen S, Pelkonen P, Rygg M (2002)
The influence of heredity for psoriasis on the ILAR classification of juvenile idiopathic arthritis
J Rheumatol, 29 (11), 2454-8
PubMed 12415608

Kristinsson J, Nygaard K, Sundseth A, Aadland E, Fagerhol MK (2002)
Comparison of faecal and intestinal concentrations of granulocyte marker protein and localization of gastrointestinal tumours in rats
Scand J Gastroenterol, 37 (9), 1029-33
DOI 10.1080/003655202320378211, PubMed 12374227

Publications 2001

Berntson L, Fasth A, Andersson-Gäre B, Kristinsson J, Lahdenne P, Marhaug G, Nielsen S, Pelkonen P, Svensson E, Nordic Study Group (2001)
Construct validity of ILAR and EULAR criteria in juvenile idiopathic arthritis: a population based incidence study from the Nordic countries. International League of Associations for Rheumatology. European League Against Rheumatism
J Rheumatol, 28 (12), 2737-43
PubMed 11764226

Johne B, Kronborg O, Tøn HI, Kristinsson J, Fuglerud P (2001)
A new fecal calprotectin test for colorectal neoplasia. Clinical results and comparison with previous method
Scand J Gastroenterol, 36 (3), 291-6
DOI 10.1080/003655201750074618, PubMed 11305517

Kristinsson J, Armbruster CH, Ugstad M, Kriwanek S, Nygaard K, Tøn H, Fuglerud P (2001)
Fecal excretion of calprotectin in colorectal cancer: relationship to tumor characteristics
Scand J Gastroenterol, 36 (2), 202-7
DOI 10.1080/003655201750065979, PubMed 11252414

Kristinsson J, Nygaard K, Aadland E, Barstad S, Sauar J, Hofstad B, Stray N, Stallemo A, Haug B, Ugstad M, Tøn H, Fuglerud P (2001)
Screening of first degree relatives of patients operated for colorectal cancer: evaluation of fecal calprotectin vs. hemoccult II
Digestion, 64 (2), 104-10
DOI 10.1159/000048848, PubMed 11684824

Steentoft A, Teige B, Ceder G, Vuori E, Kristinsson J, Simonsen KW, Holmgren P, Wethe G, Kaa E (2001)
Fatal poisoning in drug addicts in the Nordic countries
Forensic Sci Int, 123 (1), 63-9
DOI 10.1016/S0379-0738(01)00524-2, PubMed 11731199

Tórsdóttir G, Kristinsson J, Hreidarsson S, Snaedal J, Jóhannesson T (2001)
Copper, ceruloplasmin and superoxide dismutase (SOD1) in patients with Down's syndrome
Pharmacol Toxicol, 89 (6), 320-5
PubMed 11903959

Publications 2000

Snook CP, Sigvaldason K, Kristinsson J (2000)
Severe atenolol and diltiazem overdose
J Toxicol Clin Toxicol, 38 (6), 661-5
PubMed 11185975

Tórsdóttir G, Kristinsson J, Gudmundsson G, Snaedal J, Jóhannesson T (2000)
Copper, ceruloplasmin and superoxide dismutase (SOD) in amyotrophic lateral sclerosis
Pharmacol Toxicol, 87 (3), 126-30
PubMed 11068853

Publications 1999

Bo J, Schrøder H, Kristinsson J, Madsen B, Szumlanski C, Weinshilboum R, Andersen JB, Schmiegelow K (1999)
Possible carcinogenic effect of 6-mercaptopurine on bone marrow stem cells: relation to thiopurine metabolism
Cancer, 86 (6), 1080-6
PubMed 10491537

Christophersen AS, Ceder G, Kristinsson J, Lillsunde P, Steentoft A (1999)
Drugged driving in the Nordic countries--a comparative study between five countries
Forensic Sci Int, 106 (3), 173-90
DOI 10.1016/S0379-0738(99)00194-2, PubMed 10680066

Kristinsson J, Røseth AG, Sundset A, Nygaard K, Løberg EM, Paulsen JE, Aadland E, Fagerhol MK (1999)
Granulocyte marker protein is increased in stools from rats with azoxymethane-induced colon cancer
Scand J Gastroenterol, 34 (12), 1216-23
DOI 10.1080/003655299750024733, PubMed 10636069

Thomsen JB, Schroder H, Kristinsson J, Madsen B, Szumlanski C, Weinshilboum R, Andersen JB, Schmiegelow K (1999)
Possible carcinogenic effect of 6-mercaptopurine on bone marrow stem cells - Relation to thiopurine metabolism
Cancer, 86 (6), 1080-1086

Tórsdóttir G, Kristinsson J, Sveinbjörnsdóttir S, Snaedal J, Jóhannesson T (1999)
Copper, ceruloplasmin, superoxide dismutase and iron parameters in Parkinson's disease
Pharmacol Toxicol, 85 (5), 239-43
PubMed 10608487

Publications 1998

Gustafsson G, Kreuger A, Clausen N, Garwicz S, Kristinsson J, Lie SO, Moe PJ, Perkkiö M, Yssing M, Saarinen-Pihkala UM (1998)
Intensified treatment of acute childhood lymphoblastic leukaemia has improved prognosis, especially in non-high-risk patients: the Nordic experience of 2648 patients diagnosed between 1981 and 1996. Nordic Society of Paediatric Haematology and Oncology (NOPHO)
Acta Paediatr, 87 (11), 1151-61
PubMed 9846917

Jahnukainen K, Salmi TT, Kristinsson J, Müller J, Madsen B, Gustafsson G (1998)
The clinical indications for identical pathogenesis of isolated and non-isolated testicular relapses in acute lymphoblastic leukaemia
Acta Paediatr, 87 (6), 638-43
PubMed 9686656

Kristinsson J, Røseth A, Fagerhol MK, Aadland E, Schjønsby H, Børmer OP, Raknerud N, Nygaard K (1998)
Fecal calprotectin concentration in patients with colorectal carcinoma
Dis Colon Rectum, 41 (3), 316-21
DOI 10.1007/BF02237485, PubMed 9514426

Pollock SC, Kristinsson J (1998)
Cat-scratch disease manifesting as unifocal helioid choroiditis
Arch Ophthalmol, 116 (9), 1249-51
PubMed 9747695

Sigurbjörnsson S, Kjartansdóttir T, Jóhannsson M, Kristinsson J, Sigurdsson G (1998)
A pharmacokinetic evaluation of pravastatin in middle-aged and elderly volunteers
Eur J Drug Metab Pharmacokinet, 23 (1), 13-8
DOI 10.1007/BF03189821, PubMed 9625267

Snaedal J, Kristinsson J, Gunnarsdóttir S, Olafsdóttir, Baldvinsson M, Jóhannesson T (1998)
Copper, ceruloplasmin and superoxide dismutase in patients with Alzheimer's disease . a case-control study
Dement Geriatr Cogn Disord, 9 (5), 239-42
DOI 10.1159/000017067, PubMed 9701674

Publications 1997

Schmiegelow K, Glomstein A, Kristinsson J, Salmi T, Schrøder H, Björk O (1997)
Impact of morning versus evening schedule for oral methotrexate and 6-mercaptopurine on relapse risk for children with acute lymphoblastic leukemia. Nordic Society for Pediatric Hematology and Oncology (NOPHO)
J Pediatr Hematol Oncol, 19 (2), 102-9
PubMed 9149738

Publications 1996

Kristinsson J, Thordarson TH, Johannesson T (1996)
Pharmacokinetics of lignocaine in Icelandic horses after infiltration anaesthesia
Vet Rec, 138 (5), 111-2
PubMed 8650905

Steentoft A, Teige B, Holmgren P, Vuori E, Kristinsson J, Kaa E, Wethe G, Ceder G, Pikkarainen J, Simonsen KW (1996)
Fatal poisonings in young drug addicts in the Nordic countries: a comparison between 1984-1985 and 1991
Forensic Sci Int, 78 (1), 29-37
DOI 10.1016/0379-0738(95)01850-6, PubMed 8855045

Steentoft A, Teige B, Holmgren P, Vuori E, Kristinsson J, Kaa E, Wethe G, Ceder G, Pikkarainen J, Simonsen KW (1996)
Drug addict deaths in the Nordic countries: a study based on medicolegally examined cases in the five Nordic countries in 1991
Forensic Sci Int, 77 (1-2), 109-18
DOI 10.1016/0379-0738(95)01849-2, PubMed 8675131

Publications 1995

Schmiegelow K, Schrøder H, Gustafsson G, Kristinsson J, Glomstein A, Salmi T, Wranne L (1995)
Risk of relapse in childhood acute lymphoblastic leukemia is related to RBC methotrexate and mercaptopurine metabolites during maintenance chemotherapy. Nordic Society for Pediatric Hematology and Oncology
J Clin Oncol, 13 (2), 345-51
DOI 10.1200/JCO.1995.13.2.345, PubMed 7531219

Schroeder H, Garwicz S, Kristinsson J, Siimes MA, Wesenberg F, Gustafsson G (1995)
Outcome after first relapse in children with acute lymphoblastic leukemia: a population-based study of 315 patients from the Nordic Society of Pediatric Hematology and Oncology (NOPHO)
Med Pediatr Oncol, 25 (5), 372-8
PubMed 7674994

Publications 1994

Kristinsson J, Johannesson T, Bjarnason O (1994)
[The role of carbon monoxide and ethanol in fire casualties: A retrospective study of carboxyhemoglobin and blood ethanol levels in fire victims]
Laeknabladid, 80 (5), 185-8
PubMed 21593521

Kristinsson J, Snorradóttir I, Jóhannsson M (1994)
The metabolism of mebeverine in man: identification of urinary metabolites by gas chromatography/mass spectrometry
Pharmacol Toxicol, 74 (3), 174-80
PubMed 8008724

Moëll C, Marky I, Hovi L, Kristinsson J, Rix M, Moe PJ, Garwicz S (1994)
Cerebral irradiation causes blunted pubertal growth in girls treated for acute leukemia
Med Pediatr Oncol, 22 (6), 375-9
DOI 10.1002/mpo.2950220604, PubMed 8152398

Publications 1993

ROSETH AG, KRISTINSSON J, FAGERHOL MK, SCHJONSBY H, AADLAND E, NYGAARD K, ROALD B (1993)
FECAL CALPROTECTIN - A NOVEL TEST FOR THE DIAGNOSIS OF COLORECTAL-CANCER
Scand. J. Gastroenterol., 28 (12), 1073-1076

Røseth AG, Kristinsson J, Fagerhol MK, Schjønsby H, Aadland E, Nygaard K, Roald B (1993)
Faecal calprotectin: a novel test for the diagnosis of colorectal cancer?
Scand J Gastroenterol, 28 (12), 1073-6
PubMed 8303210

Publications 1991

Köppel C, Kristinsson J, Wagemann A, Tenczer J, Martens F (1991)
Chlormezanone plasma and blood levels in patients after single and repeated oral doses and after suicidal drug overdose
Eur J Drug Metab Pharmacokinet, 16 (1), 43-7
DOI 10.1007/BF03189873, PubMed 1936060

Publications 1989

Ceder G, Holmgren P, Steentoft A, Vuori E, Teige B, Kaa E, Kristinsson J, Pikkarainen J, Wethe G (1989)
[Fatal poisoning in Scandinavia--narcotic addicts are a high-risk group]
Nord Med, 104 (8-9), 224-7
PubMed 2780278

Steentoft A, Teige B, Vuori E, Ceder G, Holmgren P, Kaa E, Kristinsson J, Normann PT, Pikkarainen J (1989)
Fatal intoxications in the Nordic countries. A forensic toxicological study with special reference to young drug addicts
Z Rechtsmed, 102 (6), 355-65
PubMed 2567559

Publications 1983

Kristinsson J, Jóhannesson T, Bjarnason O, Geirsson G (1983)
Organ levels of amitriptyline and nortriptyline in fatal amitriptyline poisoning
Acta Pharmacol Toxicol (Copenh), 52 (2), 150-2
PubMed 6846023

Publications 1982

Kristinsson J (1982)
An efficient method for the extraction of antidepressant drugs from post mortem samples
Acta Pharmacol Toxicol (Copenh), 50 (4), 318-20
PubMed 7102349

Publications 1981

Kristinsson J (1981)
A gas chromatographic method for the determination of antidepressant drugs in human serum
Acta Pharmacol Toxicol (Copenh), 49 (5), 390-8
PubMed 7345880

Publications 1977

Kristinsson J, Jóhannesson T (1977)
A case of fatal propranolol intoxication
Acta Pharmacol Toxicol (Copenh), 41 (2), 190-2
PubMed 579057