A. Hagerman, K. . M. Posfay-Barbe, A. Duppenthaler, U. Heininger, C. Berger, and .-. The PIGS Influenza Study Group, “Clinical characteristics and outcomes in children hospitalised with pandemic influenza A/H1N1/09 virus infection – a nationwide survey by the Pediatric Infectious Diseases Group of Switzerland”, Swiss Med Wkly, vol. 145, no. 3132, p. w14171, Jul. 2015.