“…Included studies were conducted mainly in various Asian countries [7,13,14,21,23,25], European countries [5,8,11,15,29], Australia [9,10,17,18], but also Ghana [6] and combined population of the Botswana, Kenya, Seychelles, Uganda, Tanzania and Zambia [1]. The assessed participants were recruited mainly in a school-based manner [5,6,7,8,9,15,21,23,25,29], while for majority of studies the samples were population-based, but also in case of one study, there was a specific group of socially deprived young people included [11].…”