omid aminian center for research on occupational disease, tehran university of medical sciences, tehran, iran. zahra banafsheh alemohammad center for research on occupational disease, tehran university of medical sciences, tehran, iran. khosro sadeghniiat-haghighi department of occupational medicine, faculty of medicine, tehran university of medical sciences, tehran, iran.

maryam rabiei department of oral medicine, dental school, guilan university of medical sciences, rasht, iran. maryam shakiba department of epidemiology, shahid beheshti university of medical sciences, tehran, iran. habibolah dehgan-shahreza department of occupational health engineering, school of health, isfahan university of medical sciences , iran. mohamad talebzadeh department of oral medicine, dental school, guilan university of medical sciences, rasht, iran.

farzan madadizadeh phd student of biostatistics, department of epidemiology and biostatistics, school of public health, tehran university of medical sciences, tehran, iran leila vali assistant professor of health service management, department of management and medical information sciences, kerman university of medical sciences, kerman, iran touraj harati khalilabad phd student of health economics, department of management and medical information sciences, iran university of medical sciences, tehran, iran mohamad ezati asar phd student of health policy, department of management and medical information sciences, school of public health, tehran university of medical sciences, tehran, iran

seyedtaghi mirmohammadi department of occupational health, health sciences research center, school of health, mazandaran university of medical sciences, sari, iran jamshid yazdani-charati department of biostatistics, health sciences research center, school of health, mazandaran university of medical sciences, sari, iran

Alexis Descatha Yves Roquelaure Jean François Chastang Bradley Evanoff Maria Melchior Camille Mariot Catherine Ha Ellen Imbernon Marcel Goldberg Annette Leclerc