| # | Title | Journal | Year | Citations |
|---|
| 1 | Qualitative research: standards, challenges, and guidelines | Lancet, The | 2001 | 3,182 |
| 2 | The formalin test: an evaluation of the method | Pain | 1992 | 1,932 |
| 3 | Homocysteine and Cardiovascular Disease | Annual Review of Medicine | 1998 | 1,924 |
| 4 | Plasma Homocysteine Levels and Mortality in Patients with Coronary Artery Disease | New England Journal of Medicine | 1997 | 1,626 |
| 5 | A community-based epidemiological survey of female urinary incontinence: | Journal of Clinical Epidemiology | 2000 | 1,188 |
| 6 | Long-Term Medical and Social Consequences of Preterm Birth | New England Journal of Medicine | 2008 | 1,164 |
| 7 | Long term mortality of mothers and fathers after pre-eclampsia: population based cohort study Pre-eclampsia and cardiovascular disease later in life: who is at risk? | BMJ: British Medical Journal | 2001 | 935 |
| 8 | Cohort profile: The Norwegian Mother and Child Cohort Study (MoBa) | International Journal of Epidemiology | 2006 | 886 |
| 9 | Self‐selection and bias in a large prospective pregnancy cohort in Norway | Paediatric and Perinatal Epidemiology | 2009 | 665 |
| 10 | The art and science of clinical knowledge: evidence beyond measures and numbers | Lancet, The | 2001 | 606 |
| 11 | The prevalence of urinary incontinence in women in four European countries | BJU International | 2004 | 599 |
| 12 | The epidemiology of multiple sclerosis in Europe | European Journal of Neurology | 2006 | 507 |
| 13 | Efficacy of treating pain to reduce behavioural disturbances in residents of nursing homes with dementia: cluster randomised clinical trial | BMJ: British Medical Journal | 2011 | 461 |
| 14 | Validation of a severity index in female urinary incontinence and its implementation in an epidemiological survey. | Journal of Epidemiology and Community Health | 1993 | 428 |
| 15 | A severity index for epidemiological surveys of female urinary incontinence: Comparison with 48-hour pad-weighing tests | Neurourology and Urodynamics | 2000 | 401 |
| 16 | Are smoking and other lifestyle factors associated with female urinary incontinence? The Norwegian EPINCONT Study | BJOG: an International Journal of Obstetrics and Gynaecology | 2003 | 394 |
| 17 | Epidemiology and Natural History of Urinary Incontinence | International Urogynecology Journal | 2000 | 390 |
| 18 | Major lifestyle determinants of plasma total homocysteine distribution: the Hordaland Homocysteine Study | American Journal of Clinical Nutrition | 1998 | 389 |
| 19 | Disruption of an AP-2α binding site in an IRF6 enhancer is associated with cleft lip | Nature Genetics | 2008 | 382 |
| 20 | Non-steroidal anti-inflammatory drugs, including cyclo-oxygenase-2 inhibitors, in osteoarthritic knee pain: meta-analysis of randomised placebo controlled trials | BMJ: British Medical Journal | 2004 | 375 |
| 21 | Individual differences in tolerance to shift work – A systematic review | Sleep Medicine Reviews | 2011 | 360 |
| 22 | The Interval between Pregnancies and the Risk of Preeclampsia | New England Journal of Medicine | 2002 | 349 |
| 23 | Efficacy of classification‐based cognitive functional therapy in patients with non‐specific chronic low back pain: A randomized controlled trial | European Journal of Pain | 2013 | 346 |
| 24 | Folic acid supplements and risk of facial clefts: national population based case-control study | BMJ: British Medical Journal | 2007 | 341 |
| 25 | Genetic and Environmental Influences on Birth Weight, Birth Length, Head Circumference, and Gestational Age by Use of Population-based Parent-Offspring Data | American Journal of Epidemiology | 2007 | 324 |
| 26 | Effects of technology or maternal factors on perinatal outcome after assisted fertilisation: a population-based cohort study | Lancet, The | 2008 | 321 |
| 27 | Folate, Vitamin B12, Homocysteine, and the MTHFR 677C→T Polymorphism in Anxiety and Depression | Archives of General Psychiatry | 2003 | 308 |
| 28 | Myasthenia gravis | Neurology | 2003 | 296 |
| 29 | Fatigue in the general population: A translation and test of the psychometric properties of the Norwegian version of the fatigue severity scale | Scandinavian Journal of Public Health | 2005 | 294 |
| 30 | Body Mass Index in Adolescence in Relation to Cause-specific Mortality: A Follow-up of 230,000 Norwegian Adolescents | American Journal of Epidemiology | 2008 | 282 |
| 31 | Epidemiology and natural history of urinary incontinence in women | Urology | 2003 | 278 |
| 32 | Hip disease and the prognosis of total hip replacements | Journal of Bone and Joint Surgery: British Volume | 2001 | 271 |
| 33 | Assessment and treatment of pain in people with dementia | Nature Reviews Neurology | 2012 | 270 |
| 34 | The association between sleep duration, body mass index and metabolic measures in the Hordaland Health Study | Journal of Sleep Research | 2007 | 266 |
| 35 | Quality of life in multiple sclerosis | Neurology | 1999 | 264 |
| 36 | Sleep and Depression in Postpartum Women: A Population-Based Study | Sleep | 2009 | 257 |
| 37 | Symptomatic Pelvic Organ Prolapse | Obstetrics and Gynecology | 2007 | 253 |
| 38 | Recurrence of pre-eclampsia across generations: exploring fetal and maternal genetic components in a population based cohort | BMJ: British Medical Journal | 2005 | 252 |
| 39 | Exercise in prevention and treatment of anxiety and depression among children and young people | The Cochrane Library | 2006 | 252 |
| 40 | Preterm birth time trends in Europe: a study of 19 countries | BJOG: an International Journal of Obstetrics and Gynaecology | 2013 | 252 |
| 41 | Short-term efficacy of physical interventions in osteoarthritic knee pain. A systematic review and meta-analysis of randomised placebo-controlled trials | BMC Musculoskeletal Disorders | 2007 | 249 |
| 42 | Comparison of two questionnaires for assessing the severity of urinary incontinence: The ICIQ‐UI SF versus the incontinence severity index | Neurourology and Urodynamics | 2009 | 248 |
| 43 | A New Scale for Measuring Insomnia: The Bergen Insomnia Scale | Perceptual and Motor Skills | 2008 | 247 |
| 44 | A systematic review of overweight and obesity as risk factors and targets for clinical intervention for urinary incontinence in women | Neurourology and Urodynamics | 2008 | 246 |
| 45 | Short-term efficacy of pharmacotherapeutic interventions in osteoarthritic knee pain: A meta-analysis of randomised placebo-controlled trials | European Journal of Pain | 2007 | 242 |
| 46 | Combined Effects of Sleeping Position and Prenatal Risk Factors in Sudden Infant Death Syndrome: The Nordic Epidemiological SIDS Study | Pediatrics | 1997 | 236 |
| 47 | Diagnostic classification of female urinary incontinence: An epidemiological survey corrected for validity | Journal of Clinical Epidemiology | 1995 | 232 |
| 48 | Shared Understanding of the Qualitative Research Process. Guidelines for the Medical Researcher | Family Practice | 1993 | 226 |
| 49 | Genome-wide association study of renal cell carcinoma identifies two susceptibility loci on 2p21 and 11q13.3 | Nature Genetics | 2011 | 220 |
| 50 | A systematic review with procedural assessments and meta-analysis of Low Level Laser Therapy in lateral elbow tendinopathy (tennis elbow) | BMC Musculoskeletal Disorders | 2008 | 216 |
