zahra boroumandfar infectious diseases and tropical medicine research center, isfahan university of medical sciences, isfahan, iran farzin khorvash nosocomial infection research center, department of infectious diseases, medical school, isfahan university of medical sciences, isfahan, iran katayoun taeri behavioral disease council center, isfahan university of medical sciences, isfahan, iran mahrdad salehi psychosomatic research center, isfahan university of medical sciences, isfahan, iran ghasem yadegarfar department of epidemiology and biostatistics, school of health, and heart failure research center, isfahan university of medical sciences, isfahan, iran

mohammadreza khami assistant professor, department of community oral health, research center for caries prevention, tehran university of medical sciences, tehran, iran. samaneh razeghi community oral health, research center for caries prevention, tehran university of medical sciences, tehran, iran. seyedmahdi mirmohammadi dentist, medical laser research center, acecr, tehran, iran.

Jean-Pierre Allain Susan L Stramer A B F Carneiro-Proietti M L Martins S N Lopes da Silva M Ribeiro F A Proietti Henk W Reesink

G Coulon