title: Re: "Medical practice-based influenza surveillance: viral prevalence and assessment of morbidity".
authors.forename: H C
authors.initials: HC
authors.lastname: Matter
authors.forename: M
authors.initials: M
authors.lastname: Zwahlen
authors.forename: J
authors.initials: J
authors.lastname: Cloetta
authors.forename: P
authors.initials: P
authors.lastname: Helbling
authors.forename: H
authors.initials: H
authors.lastname: Zimmermann
mesh_terms: D000328:Adult; D017677:Age Distribution; D002648:Child; D006801:Humans; D015994:Incidence; D007251:Influenza, Human / Q000453:epidemiology* / Q000821:virology; D008824:Michigan / Q000453:epidemiology; D009017:Morbidity; D015995:Prevalence; D018571:Sentinel Surveillance; D013557:Switzerland / Q000453:epidemiology