European journal of obstetrics, gynecology, and reproductive biology
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Eur. J. Obstet. Gynecol. Reprod. Biol. · May 1996
Randomized Controlled Trial Multicenter Study Comparative Study Clinical TrialPain relief during and following outpatient curettage and hysterosalpingography: a double blind study to compare the efficacy and safety of tramadol versus naproxen. Cobra Research Group.