PT - JOURNAL ARTICLE AU - M Masoudi AU - M Saadat TI - Altitude, latitude and sex ratio at birth in Iran AID - 10.1136/jech.2006.050492 DP - 2007 Feb 01 TA - Journal of Epidemiology and Community Health PG - 172--172 VI - 61 IP - 2 4099 - http://jech.bmj.com/content/61/2/172.1.short 4100 - http://jech.bmj.com/content/61/2/172.1.full SO - J Epidemiol Community Health2007 Feb 01; 61