| http://www.w3.org/ns/prov#value | - In addition to questions on age, sex, socioeconomic characteristics, and social and political attitudes, the participants were asked whether they have or had siblings; if so, they were asked when their eldest sibling was born, whether he or she was still alive at the time of the survey, and if not, how old was he or she when he or she died and the cause of death if known.
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