Questionnaire
’ behavior
A previously validated questionnaire [In the knowledge section, correct answers scored one and incorrect answers scored zero. In a Likert scale, correct answers included “I strongly agree” and “I agree” for questions with a positive answer and “I disagree” and “I strongly disagree” for questions with a negative answer. Then, the sum score of the questions (0 to 9) was calculated for each subject. In the attitude section, a 5-point Likert scale from “I strongly agree” to “I strongly disagree” was dichotomized and the total score was calculated (6 to 30). In the self-reported behavior section, the sum score of questions (0 to 6) was calculated for each person. Parents’ and children’ behavior questions included three questions. The correct answers scored 1 vs. 0 for incorrect answers. Then, the sum score (0 to 3) was calculated for each person.