Ethical Issues Although in EU countries, according to their current legislation, it is not mandatory for this type of studies (i.e., population-based cross-sectional survey) to obtain either a formal approval of the study protocol from ethics committees or the written consent signed by survey participants, following the request of the European Commission, we will satisfy these both these ethical requirements. Thus, after evaluation of the Italian Ethics Committee (i.e., the Ethics Committee of the study coordinator), the study protocol will be submitted for evaluation to the Ethics Committees of the other 11 countries where data will be collected. Moreover, formal consent (and signature in case of P&P interview) will be obtained from each adult participant, and, in case of minors from one of their parents or legal tutors. All data will be managed anonymously, in respect of the privacy regulations in force, only for scientific purposes, without any lucrative aim. These and other measures are in agreement with national and current or forthcoming EU (i.e., Directive 95/46/EC) regulations.