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Contributors All authors were involved in preparing and editing the final manuscript and writing the commentary.
Funding MC is supported, in part, by grants Agence Nationale de la Recherche (ANR-12-RPIB-0014 and ANR-13-BSV3-0014) and Fondation pour la Recherche Médicale (Equipe FRM).
Competing interests None.
Provenance and peer review Commissioned; externally peer reviewed.
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