Source: https://www.researchgate.net/profile/Isabelle-Pitrou/publication/23680705_The_Strengths_and_Difficulties_Questionnaire_validation_study_in_French_school-aged_children_and_cross-cultural_comparisons/links/543d28510cf240f04d0e7d87/The-Strengths-and-Difficulties-Questionnaire-validation-study-in-French-school-aged-children-and-cross-cultural-comparisons.pdf