Dagmar Amtmann Alyssa M Bamer Kurt L Johnson Dawn M Ehde Meghan L Beier Jamie L Elzea Charles H Bombardier

majid bagheri hossein abadi school of public health, shahroud university of medical sciences, shahroud, ir iran hesam akbari health research center, baqiyatallah university of medical sciences, tehran, ir iran hamed akbari health research center, baqiyatallah university of medical sciences, tehran, ir iran; health research center, baqiyatallah university of medical sciences, tehran, ir iran mohammad gholami-fesharaki biostatistics department, faculty of medical sciences, tarbiat modares university, tehran, ir iran mohammad ghasemi health research center, baqiyatallah university of medical sciences, tehran, ir iran

reza firoozabadi harborview medical center, university of washington, seattle, wa, usa william w. cross iii mayo clinic, 201 w. center st. rochester, mn, usa james c. krieg thomas jefferson university, 925 chestnut street, philadelphia, pa, usa milton l. “chip” routt, jr. university of texas, 6414 fannin, suite g150, houston, tx, usa