4Reefhuis J, Honein MA, Schieve LA, et al. Assisted reproductive technology and major structural birth defects in the United States [ J ]. Hum Reprod, 2009,24 : 360-366.
5Olson CK, Keppler-NoreuiI KM, Romitti PA, et al. In vitro fertilization is associated with an increase in major birth defects [ J ]. FertiI Steri1,2005,84 : 1308-1315.
6Anthony S, Buitendijk SE, Dorrepaal CA, et al. Congenital malformations in 4224 children conceived after IVF [ J ]. Hum Reprod,2002,17:2089-2095.
8Hansen M, Sullivan E, Jequier AM, et al. Practitioner reporting of birth defects in children born following assisted reproductive technology:does it still have a role in surveillance of birth defects ? [ J ]. Hum Reprod, 2007,22 : 516- 520.
9Thurin A, Hausken J, Hillensjo T, et al. Elective singleembryo transfer versus double-embryo transfer in in vitro fertilization[ J]. N Engl J Meal,2004,351:2392-2402.
6Manipalviratn S, Decherney A, Segars J. Imprinting disorders and assisted reproductive technology[ J]. Fertil Steril,2009,91 ( 2 ) : 305 - 315.
7Price MO,Thompson RW,Price FW. Risk factors for va- rious causes of failure in initial corneal grafts[J]. Arc Ophthalmol, 2003,121 (8) : 1087-1092.
8Hill JC. Systemic eyelosporine in high-risk keratoplasty: short-versus long term therapy[J]. Ophthalmol, 1994,101 (1):128 -133.
9Willams KA, Muehlaerg SM, Lewis RF. How successful is corneal trarsplantation? A report from the Australian Corneal Graft Register[J]. Eye, 1995,9(2) : 219-233.