Efficacy and safety of tramadol in pain relief during diagnostic outpatient hysteroscopy: systematic review and meta-analysis of randomized controlled trials by Mattar, Omar M., Abdalla, Ahmed R., Shehata, Mohamed S.A., Ali, Ahmed Said, Sinokrot, Muhammed, Abdelazeim, Bassant A., Taher, Ayman, Samy, Ahmed, Mahmoud, Mostafa, Abbas, Ahmed M.

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