A structured questionnaire, available from the authors on request, was used to collect the required information on tea consumption, demographic characteristics, personal habits, usual diet, and factors relevant to hormonal status. The questionnaire was modified from the Hawaii Cancer Research Survey (16) . The components relating to habitual diet in the questionnaire were adapted from a Food Frequency Questionnaire (17) used for studying cancers of the esophagus, pancreas, and stomach in Shanghai (<200 km from Hangzhou), to ensure cultural relevance in southeast China. Additional lifestyle questions were taken from the Australian Health Survey 1995 (18) and the United States food survey 1992 (19) . The questionnaire was translated into Chinese and checked (back translated) by three professional Chinese translators.
การแปล กรุณารอสักครู่..
