Submitted on: 16 February 1998.
Revised on: 13 April 1998.
Accepted on: 28 May 1998.
___________________JOURNAL OF OBSTETRICS AND GYNAECOLOGY RESEARCH
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Submitted on: 04 October 1998.
Revised on: 12 December 1998.
Accepted on: 08 February 1999.
___________________JOURNAL OF OBSTETRICS AND GYNAECOLOGY RESEARCH
Submitted on: 30 April 2007.
Revised on: 02 August 2007.
Accepted on: 23 August 2007.
___________________JOURNAL OF OBSTETRICS AND GYNAECOLOGY RESEARCH
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Submitted on: 26 November 2011.
Revised on: 04 February 2012.
Accepted on: 28 February 2012.
___________________JOURNAL OF OBSTETRICS AND GYNAECOLOGY RESEARCH