| Molecular subtypes, histopathological grade and survival in a historic cohort of breast cancer patients MJ Engstrøm, S Opdahl, AI Hagen, PR Romundstad, LA Akslen, ... Breast cancer research and treatment 140, 463-473, 2013 | 331 | 2013 |
| Risk of hypertensive disorders in pregnancies following assisted reproductive technology: a cohort study from the CoNARTaS group S Opdahl, AA Henningsen, A Tiitinen, C Bergh, A Pinborg, ... Human Reproduction 30 (7), 1724-1731, 2015 | 197 | 2015 |
| Effect of maternal age on maternal and neonatal outcomes after assisted reproductive technology AL Wennberg, S Opdahl, C Bergh, AKA Henningsen, M Gissler, ... Fertility and sterility 106 (5), 1142-1149. e14, 2016 | 145 | 2016 |
| Mortality among young adults born preterm and early term in 4 Nordic nations K Risnes, JF Bilsteen, P Brown, A Pulakka, AMN Andersen, S Opdahl, ... JAMA Network Open 4 (1), e2032779-e2032779, 2021 | 98 | 2021 |
| Joint effects of nulliparity and other breast cancer risk factors S Opdahl, MDK Alsaker, I Janszky, PR Romundstad, LJ Vatten British journal of cancer 105 (5), 731-736, 2011 | 87 | 2011 |
| Perinatal and maternal outcome after vitrification of blastocysts: a Nordic study in singletons from the CoNARTaS group E Ginström Ernstad, AL Spangmose, S Opdahl, AKA Henningsen, ... Human Reproduction 34 (11), 2282-2289, 2019 | 63 | 2019 |
| Invasive lobular breast cancer: the prognostic impact of histopathological grade, E‐cadherin and molecular subtypes MJ Engstrøm, S Opdahl, LJ Vatten, OA Haugen, AM Bofin Histopathology 66 (3), 409-419, 2015 | 62 | 2015 |
| Reproductive factors and the risk of breast cancer in old age: a Norwegian cohort study J Horn, BO Åsvold, S Opdahl, S Tretli, LJ Vatten Breast cancer research and treatment 139, 237-243, 2013 | 61 | 2013 |
| High birth weight and large-for-gestational-age in singletons born after frozen compared to fresh embryo transfer, by gestational week: a Nordic register study from the … AM Terho, S Pelkonen, S Opdahl, LB Romundstad, C Bergh, ... Human Reproduction 36 (4), 1083-1092, 2021 | 54 | 2021 |
| Association of time since last birth, age at first birth and parity with breast cancer survival among parous women: A register‐based study from Norway MDK Alsaker, S Opdahl, PR Romundstad, LJ Vatten International journal of cancer 132 (1), 174-181, 2013 | 53 | 2013 |
| Association of size at birth with adolescent hormone levels, body size and age at menarche: relevance for breast cancer risk S Opdahl, TIL Nilsen, PR Romundstad, E Vanky, SM Carlsen, LJ Vatten British journal of cancer 99 (1), 201-206, 2008 | 51 | 2008 |
| The prognostic value of androgen receptors in breast cancer subtypes MR Kraby, M Valla, S Opdahl, OA Haugen, JE Sawicka, MJ Engstrøm, ... Breast Cancer Research and Treatment 172, 283-296, 2018 | 50 | 2018 |
| T-cell acute lymphoblastic leukemia in patients 1–45 years treated with the pediatric NOPHO ALL2008 protocol P Quist-Paulsen, N Toft, M Heyman, J Abrahamsson, L Griškevičius, ... Leukemia 34 (2), 347-357, 2020 | 47 | 2020 |
| Weight change in adulthood and risk of postmenopausal breast cancer: the HUNT study of Norway MDK Alsaker, I Janszky, S Opdahl, LJ Vatten, PR Romundstad British journal of cancer 109 (5), 1310-1317, 2013 | 46 | 2013 |
| Reproductive history and the risk of molecular breast cancer subtypes in a prospective study of Norwegian women J Horn, S Opdahl, MJ Engstrøm, PR Romundstad, S Tretli, OA Haugen, ... Cancer Causes & Control 25, 881-889, 2014 | 45 | 2014 |
| Obstetric and perinatal risks in 4601 singletons and 884 twins conceived after fresh blastocyst transfers: a Nordic study from the CoNARTaS group AL Spangmose, E Ginström Ernstad, S Malchau, J Forman, A Tiitinen, ... Human Reproduction 35 (4), 805-815, 2020 | 44 | 2020 |
| Trends over time in congenital malformations in live‐born children conceived after assisted reproductive technology AKA Henningsen, C Bergh, R Skjaerven, A Tiitinen, UB Wennerholm, ... Acta obstetricia et gynecologica Scandinavica 97 (7), 816-823, 2018 | 44 | 2018 |
| Insomnia and the risk of breast cancer: the HUNT study A Sen, S Opdahl, LB Strand, LJ Vatten, LE Laugsand, I Janszky Psychosomatic Medicine 79 (4), 461-468, 2017 | 43 | 2017 |
| Hypertensive diseases in pregnancy and breast cancer risk S Opdahl, PR Romundstad, MDK Alsaker, LJ Vatten British journal of cancer 107 (1), 176-182, 2012 | 43 | 2012 |
| Molecular subtypes of breast cancer: long-term incidence trends and prognostic differences M Valla, LJ Vatten, MJ Engstrøm, OA Haugen, LA Akslen, JH Bjørngaard, ... Cancer Epidemiology, Biomarkers & Prevention 25 (12), 1625-1634, 2016 | 42 | 2016 |
