“…Most of the studies published were from Europe (18; 85.7%): five from Sweden [20,38,46,57,59], three from the Netherlands Observational studies including descriptive studies, evidence that the population described belongs to a defined area, region or country [9,22,54], three from the United Kingdom [34,45,61], two from Germany [25,60] and one each from Spain [29], Belgium [18], Serbia [56], Ireland [35], and Poland [28]. There was only one study from the United States of America (USA), which was also the oldest [48], only one from Singapore [53], and only one from Australia [51].…”