Competing interests
TP reports grants from Cidelec, Löwenstein Medical, Novartis, ResMed, and personal fees from Bayer Healthcare, Cerebra, Jazz Pharma, outside the submitted work. IF reports personal fees from ResMed, grants from Weinmann, personal fees from Philips, grants from Fisher Paykel, outside the submitted work. None other financial disclosures. JS, NL, MG, MZ, AD and KL do not have competing interests.