Use of oral contraceptives and risk of ulcerative colitis — A systematic review and meta-analysis

The association between new generation oral contraceptive pill and the development of inflammatory bowel diseases

Exposure to oral contraceptives increases the risk for development of inflammatory bowel disease: a meta-analysis of case-controlled and cohort studies

Oral contraceptives, reproductive factors and risk of inflammatory bowel disease

Hormone Therapy Increases Risk of Ulcerative Colitis but not Crohn’s Disease

Aspirin, nonsteroidal anti-inflammatory drug use, and risk for Crohn disease and ulcerative colitis: a cohort study

Aspirin in the aetiology of Crohn’s disease and ulcerative colitis: a European prospective cohort study

Hormonal replacement therapy after menopause is protective of disease activity in women with inflammatory bowel disease

The Risk of Oral Contraceptives in the Etiology of IBD

Risk factors for inflammatory bowel disease in the general population (Nested case-controls. UK)