... scientifically validat-ed information on subjects such as health pro-motion, means of prevention, diseases, health services, etc. using different means and levels of communication that are adapted ... is often poorly defined (the Guide d’analyse de la littérature et gradation des recommandations8, Anaes, 8. “Guide for the analysis of literature and recommendation gra-ding.” Prevention of ... 13% of the population (Institut de la statistque du Quebec, 2003).In Switzerland this age group counts 1.1 million indivi-duals, or 15% of the total population (OFS (Of ce fédéral de la statistique),...