“…The questionnaires implemented in the different studies varied in the number of questions (ranged from 15 21,36 to 82 questions 40 ), and the authors resorted to "Yes/ No" questions, 19,20,23,25,27,32,33,36,37,41,43 multiple-choice, 22,31 and Likert scales. 21,24,26,[28][29][30]34,37,38,40,42 All questionnaires were selfanswered, 10 of which were carried out online. 23,[26][27][28]30,31,36,39,41 The content of the questionnaires applied is summarized in Table 2.…”