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\bibitem{Officefederaldesassurancessociales2008} Office f{\'e}d{\'e}ral des assurances sociales. (2008). \textit{Assurances sociales en Suisse : statistique de poche 2008}. Berne: Office f{\'e}d{\'e}ral des assurances sociales (OFAS).

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