“…This large variation may be explained in large part by the different methodological approaches used and the different populations studied. Some works included the total of women of reproductive age (with different age limits) 10,11,12,13,14,15,16,19,20,21,23 , and others focused only on young women 25,26,27,28 , or women with a previous pregnancy 17,22,23,24 , or a specific population group 29,30,31,32,33,34,35 . Studies with direct methods employed face-to-face interviews 10,11,14,17,21,22,23,24,25,26,27,29,31,32,33,35 , self-administered questionnaires 28 , ballot box method 12,13,30,34 or the RRT …”