2012d-971 balkanpeninsula datacollection demoskopie eastern epidemiology europe globalhealth healthsurveys history kommunismus methodology methods post-communism postkommunismus psychologicalaspects psychology publicopinion publicopinionpolls research sampling(statistics) samplingstudies selbstmord self-injuriousbehavior socialsciences socialsurveys sozialwissenschaften statistics suicide surveysandquestionnaires wm165 worldhealth yh3700