“…A majority (n=35) of models include variables obtained through a questionnaire [18,19,21,22,23,24,25,26,27,28,30,33,36,37,38,39,40,41,42,43,44,45,46,49,50,51,53,54]. The questionnaires range from those with only one or two simple questions to those with detailed questions on factors such as diet, physical activity, alcohol and smoking habits and past medical facts.…”