“…Fourteen studies had been conducted in Europe-Great Britain [33,40,43,60], Austria [34,51], Sweden [36,37], Ireland [61], Germany [45], Switzerland [48], Greece [56], The Netherlands [50] and France [39], nine in the USA [38,42,44,46,52,53,55,57,62], seven in Australia [32,35,41,47,49,58,59], and one in Singapore [54].…”