“…Tables 2 and 3 list the characteristics of all the included studies. Seven (18%) of the 38 included studies were carried out in Saudi Arabia, 28–30,36,41,42,45 4 (11%) were carried out in the UK, 35,37,46,49 3 (8%) were carried out in the United States, 50,53,59 2 (5%) was carried out in Germany, 18,38 2 (5%) was carried out in Turkey, 51,52 2 (5%) was carried out in Australia and New Zealand, 47,59 2 (5%) was carried out in Canada, 14,19 and other studies were carried out in Pakistan, 26 Jordan, 27 Ireland, 32 United Arab Emirates, 33 India, 39 Singapore, 43 Brazil, 44 Vietnam, 55 South Korea, 56 Switzerland, 57 and Croatia 58 . Also, three studies were widely conducted in several countries around the world 31,48,60 .…”