a barkhordari occupational health department, faculty of health, shahid sadoughi university of medical sciences, yazd, iran cjp jones maternal and fetal health research centre, mahsc, the university of manchester, uk rw stoddart laboratory medicine academic group, the medical school, the university of manchester, uk sf mcclure laboratory medicine academic group, the medical school, the university of manchester, uk j mcclure laboratory medicine academic group, the medical school, the university of manchester, uk s rahimi moghadam occupational health department, neyshabur university of medical sciences, neyshabur, iran

Yuzuru Ikehara Takashi Sato Toru Niwa Sachiko Nakamura Masanori Gotoh Sanae Kabata Ikehara Katsue Kiyohara Chihiro Aoki Toshie Iwai Hayao Nakanishi Jun Hirabayashi Masae Tatematsu Hisashi Narimatsu