mojtaba mahmoodi health policy research center and school of medicine, shiraz university of medical sciences, shiraz, iran. anahid safari department of pharmacology, school of medicine, islamic azad university, kazeroon branch, kazeroon, iran. mehrdad vossoughi department of dental public health, school of dentistry, shiraz university of medical sciences, shiraz, iran. fatemeh golbon-haghighi student research committee, shiraz university of medical sciences, shiraz, iran. maliheh kamali-sarvestani student research committee, shiraz university of medical sciences, shiraz, iran. haleh ghaem department of epidemiology, school of health, shiraz university of medical sciences, shiraz, iran.

E M van Schalkwyk C Schultz J R Joubert N W White