{{Cite journal| doi = 10.1136/bmjopen-2021-054504| issn = 2044-6055 (Electronic) 2044-6055 (Linking)| volume = 12| issue = 5| pages = –054504| last1 = Ageron| first1 = F. X.| last2 = Hugli| first2 = O.| last3 = Dami| first3 = F.| last4 = Caillet-Bois| first4 = D.| last5 = Pittet| first5 = V.| last6 = Eckert| first6 = P.| last7 = Beysard| first7 = N.| last8 = Carron| first8 = P. N.| title = Lessons from COVID-19 syndromic surveillance through emergency department activity: a prospective time series study from western Switzerland| journal = BMJ Open| date = 2022-05-07| pmid = 35523491}}