推 stillcat:sent! 04/12 08:30
1. Soft versus rigid vacuum extractor cups for assisted vaginal delivery.
Johanson R, Menon V.
Cochrane Database Syst Rev. 2010 Nov 10;(11):CD000446.
2. A randomized prospective study comparing delivery with metal and silicone
rubber vacuum extractor cups.
Chenoy R, Johanson R.
Br J Obstet Gynaecol. 1992 May;99(5):360-3.
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