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Bollag, U (2009). Asthma data from the Swiss Sentinella Network. Swiss medical weekly, 139(39-40), pp. 571-575. Muttenz: EMH Schweizerischer Ärzteverlag
Bollag, U; Frey, P (2009). From monitoring to research - validating asthma data from the Swiss Sentinel Surveillance Network (SSSN). In: WONCA-Kongress. Basel.