8Malleshwari A, Poncr M,Shetty A,et a/.Women awarene~ and perceptions of delay in chi!d-bearing[J].Fertil Steril 2008,90(4) : 1036-1042.
9Ooki S.Matemal age and birth defects after the use of assisted reproductive technology in Japan, 2004-2010[J].Int J Womens Heahh, 2013,2013 (5) : 65-77.
10Johnson JA,Tough S.Soeiety of obstetricians and gynaecologists of Canada[J].J Obstet Gynaecol Can,2012,34 (1):80-93.