Zhonghua Yi Shi Za Zhi. 2001 Apr; 31(2):110-2.

[Zhonghua Yi Shi Za Zhi. 2001]

Rev Fr Gynecol Obstet. 1992 Oct; 87(10):493-6, 499-505.

[Rev Fr Gynecol Obstet. 1992]

Ginecol Obstet Mex. 1969 Dec; 26(158):751-7.

[Ginecol Obstet Mex. 1969]

Eur J Obstet Gynecol Reprod Biol. 2005 Nov 1; 123(1):3-8.

[Eur J Obstet Gynecol Reprod Biol. 2005]

Neurosurg Focus. 2007; 23(1):E9.

[Neurosurg Focus. 2007]