TY - JOUR T1 - Umrah. An opportunity for mass gatherings health research JF - Saudi Medical Journal JO - Saudi Med J SP - 868 LP - 871 DO - 10.15537/smj.2017.8.20124 VL - 38 IS - 8 AU - Saber Yezli AU - Yara M. Yassin AU - Amnah H. Awam AU - Amaar A Attar AU - Emad A. Al-Jahdali AU - Badriah M. Alotaibi Y1 - 2017/08/01 UR - http://smj.org.sa/content/38/8/868.abstract N2 - ER -