[1] Univ Bonn, Ophthalmol, Bonn, Germany
[2] GRADE Reading Ctr, Bonn, Germany
[3] Bern Univ Hosp, Inselspital, Dept Ophthalmol, Bern, Switzerland
[4] Bern Univ Hosp, Inselspital, Dept Clin Res, Bern, Switzerland
[5] Univ Bern, Bern, Switzerland
[6] Univ Oxford, Sleep & Circadian Neurosci Inst, Nuffield Lab Ophthalmol, Nuffield Dept Clin Neurosci, Oxford, England
[7] Univ Bonn, Med Fac, Inst Med Biometry Informat & Epidemiol, Bonn, Germany