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Little is known about the factors that affect the sex ratio in humans. Many animal and human studies have indicated an association between environmental toxins and altered sex ratios.1,2 Masjid-i-Sulaiman (MIS) is located in the Khozestan province, southwest of Iran. The first oil well in the Middle East was located in MIS (excavated in 1908 by William Darcy). Petroleum—whether gas, oil, or liquid asphalt—that exudes in the form of springs and seepages may …
This study was supported by Shiraz University