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NAZIA LIAQAT; NAHEED AKHTAR; SAIRA SHAGUFTA; SALMA LIAQAT; SYEDA SITWAT FATIMA. FREQUENCY OF BILATERAL TUBAL OBSTRUCTION AND COMMON FACTORS LEADING TO IT AMONG WOMEN PRSESENTING WITH SECONDARY INFERTILITY. J Saidu Med Coll 2016, 6, 766-770.