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Tschopp M, Sattelmayer MK, Hilfiker R.Tschopp M, et al. Among authors: hilfiker r.Age Ageing. 2011 Sep;40(5):549-56. doi: 10.1093/ageing/afr005. Epub 2011 Mar 7.Age Ageing. 2011.PMID: 21383023Review.
Bernhardt I, Marbacher M, Hilfiker R, Radlinger L.Bernhardt I, et al. Among authors: hilfiker r.Early Hum Dev. 2011 Sep;87(9):633-9. doi: 10.1016/j.earlhumdev.2011.04.017. Epub 2011 May 26.Early Hum Dev. 2011.PMID: 21616611