A randomized controlled study comparing pain experience between a newly designed needle with a thin tip and a standard needle for oocyte aspiration

M. Wikland, S. Blad, L. Bungum, T. Hillensjö, P.O. Karlström and S. Nilsson
Hum. Reprod. (2011) doi: 10.1093/humrep/der100 (on-line article).

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