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IMPORTANCE: Kawasaki disease is a leading cause of acquired heart disease among children in high-income countries, but potential associations between fertility treatments and Kawasaki disease remain unknown, despite both becoming increasing…

OBJECTIVE: To classify diseases based on age at peak incidence to identify risk factors for later disease in women's life course. DESIGN: A cross-sectional baseline survey of participants in the Japan Nurses' Health Study. SETTING: A nation…