title: Re: "fragmentation and stability of circadian activity rhythms predict mortality: the Rotterdam study".
authors.affiliation: Institute and Policlinic for Occupational Medicine, Environmental Medicine and Prevention Research, University Hospital of Cologne, Cologne, Germany.
authors.forename: Thomas C
authors.initials: TC
authors.lastname: Erren
authors.affiliation: Institute and Policlinic for Occupational Medicine, Environmental Medicine and Prevention Research, University Hospital of Cologne, Cologne, Germany.
authors.forename: J Valérie
authors.initials: JV
authors.lastname: Gross
mesh_terms: D002940:Circadian Rhythm / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D009026:Mortality; D012890:Sleep / Q000502:physiology*