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Schwegler, Kyrill; Klaghofer, Richard; Nirkko, Arto C; Mathis, Johannes; Hersberger, Kurt E; Bloch, Konrad E (2006). Sleep and wakefulness disturbances in Swiss pharmacy customers. Swiss medical weekly, 136(9-10), pp. 149-54. Muttenz: EMH Schweizerischer Ärzteverlag