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Footnotes
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Swiss Paediatric Surveillance Unit representatives C Aebi, W Bär, M Bianchetti, A Blumberg, H U Bucher, L Buetti, O Carrel, P O Cattin, A Corboz, P Diebold, P Dolivo, F Farron, M Gehri, E Giannoni, C A Haenggeli, P Hüppi, P Imahorn, C Kind, B Knöpfli, B Laubscher, U Lips, A Malzacher, J Mc Dougall, P Meyer, M Mönkhoff, V Pezzoli, K Posfay Barbe, L Reinhard, F Renevey, H Roten, C Rudin, V Schlumbom, S Sizonenko, C Stüssi, R Tabin, P Terrier, J Wildhaber, M Wopmann, G Zeilinger, A Zemmouri, U Zimmermann.
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Competing interests None.
Ethics approval This study was conducted according to the ethical guidelines of the SPSU and approved by the ethics committee of the University Hospital of Zurich.
Provenance and peer review Not commissioned; externally peer reviewed.