By Rainer Helmut   in Journal of Population Economics

ISSN:0933-1433|21|2|305-329

Springer Publishing Company ‎(2008)‎

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By Olbrich Carsten   Gessner Andrea   Kayser Oliver   Müller Rainer Helmut   in Journal of Drug Targeting

ISSN:1061-186X|10|5|387-396

Informa Healthcare‎(2002)‎

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