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Data collection

Interviews are conducted by trained health workers using a standardized questionnaire. The questionnaires are designed to gather data on lifestyle, reproductive history, physical activity/inactivity, and diet for both cases and controls. Blood and spot urine samples are collected, and height, weight, waist, and hip circumference are measured for all women. In addition, the women undergo dual-energy X-ray absorptiometry (DXA) and computed tomography (CT) scans to provide a more accurate estimate of body composition (lean tissue vs fat).