“…All included studies were written in English and published between 2001 and 2017. Among these 38 included studies, 10 studies were done in Europe, 12,20,23,25,31,34,42,44,48,49 20 in the United States and Canada, 10,17,18,21,22,24,29,30,33,35,36,[39][40][41]43,45,47,50,51 3 in Middle America, 11,27,28 1 in Africa (Egypt), 26 and the remaining 2 studies in Asia (Iran). 19,46 In addition, two studies were done among populations from different countries.…”