Data were collected by face-to-face interview after obtaining the consent of the participant. All of the interviews were conducted in the native Hangzhou dialect by the first author. Habitual tea drinking was assessed before a “reference date,” defined as 5 years before the diagnosis (cases) or interview (controls). Frequencies and quantities of tea consumed were estimated by the participants without any attempt to recall what they exactly consumed at that time. Each interview usually took between 40 and 50 min. For the cases, 226 women (89%) were either inpatients or at hospitals for follow-up treatment, 25 women (10%) were interviewed at their homes, whereas 3 women (1%) completed their interviews at their work places. The 51 community women were interviewed at their homes, community areas near their homes, or their work places.