[1] Inst Politecn Lisboa, Escola Super Tecnol Saude Lisboa ESTeSL, Lisbon, Portugal
[2] Univ Nova Lisboa, Comprehens Hlth Res Ctr CHRC, Escola Nacl Saude Publ, Lisbon, Portugal
[3] Univ Jyvaskyla, Fac Sport & Hlth Sci, Gerontol Res Ctr, Jyvaskyla, Finland
[4] Morgan State Univ, Sch Comp Math & Nat Sci, Dept Biol, Baltimore, MD USA
[5] Univ Jyvaskyla, Dept Math & Stat, Jyvaskyla, Finland
[6] Shahroud Univ Med Sci, Ophthalm Epidemiol Res Ctr, Shahroud, Iran
[7] Univ Warmia & Mazury, Dept Ophthalmol, Olsztyn, Poland
[8] Fdn Ophthalmol Dev, Inst Res Ophthalmol, Poznan, Poland