J. Check

Publications824
h-index35
Citations6,346
Highly Influential Citations161
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EFFECT OF AN ABNORMAL SPERM CHROMATIN STRUCTURAL ASSAY (SCSA) ON PREGNANCY OUTCOME FOLLOWING (IVF) WITH ICSI IN PREVIOUS IVF FAILURES
A high DNA fragmentation index (DFI) when performing the sperm chromatin structural (SCSAr) assay was claimed to be so specific for male subfertility that even IVF with ICSI did not result in live… Expand
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Pregnancy rates in donors versus recipients according to the serum progesterone level at the time of human chorionic gonadotropin in a shared oocyte program.
Previous data suggested a subtle increase in serum P at the time of hCG injection without LH surge reduces the PR of women having oocyte retrievals for IVF; this study compared PRs of recipients in a… Expand
  • 49
  • 6
Embryo transfer technique as a cause of ectopic pregnancy in in vitro fertilization.
A randomized prospective study was performed to compare the effects of a midfundal versus a deep fundal transfer technique on subsequent intrauterine and ectopic PRs after IVF. The clinical… Expand
  • 112
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The effect on IVF outcome of small intramural fibroids not compressing the uterine cavity as determined by a prospective matched control study.
BACKGROUND Several studies have reported that the presence of intramural fibroids affects conception following IVF. We attempted to corroborate or refute the conclusions relating to IVF and… Expand
  • 79
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The importance of laparoscopic coagulation of mild endometriosis in infertile women.
To evaluate the effect of fulguration of endometriotic implants in patients with mild endometriosis, we divided 123 patients into two groups: (A) patients whose endometriotic implants were… Expand
  • 60
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Controlled Ovarian Hyperstimulation Adversely Affects Implantation Following In Vitro Fertilization–Embryo Transfer
Purpose:Our purpose was to determine if controlled ovarian hyperstimulation adversely affects implantation.Methods:A retrospective comparison of pregnancy rates (PRs) and implantation rates was made… Expand
  • 80
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The effect of assisted hatching on pregnancy rates after frozen embryo transfer.
OBJECTIVE To compare clinical pregnancy and implantation rates after transfer of frozen-thawed embryos prepared according to an assisted hatching protocol or a nonassisted hatching protocol. DESIGN… Expand
  • 87
  • 3
A guanine nucleotide‐binding regulatory protein in human sperm mediates acrosomal exocytosis induced by the human zona pellucida
Guanine nucleotide‐binding regulatory proteins play key intermediary roles in regulating zona pellucida‐mediated acrosomal exocytosis in mouse and bull sperm. Since human sperm possess a Gi‐like… Expand
  • 82
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Increased endometrial thickness on the day of human chorionic gonadotropin injection does not adversely affect pregnancy or implantation rates following in vitro fertilization-embryo transfer.
OBJECTIVES To investigate the controversy whether an increased endometrial thickness has an effect on pregnancy, implantation, or abortion rates in in vitro fertilization-embryo transfer (IVF-ET)… Expand
  • 113
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Two methods of achieving pregnancies despite subnormal hypo-osmotic swelling test scores.
OBJECTIVE To determine whether either the use of intracytoplasmic sperm injection (ICSI) or chymotrypsin-galactose pretreatment of sperm before IUI can improve pregnancy results in female partners of… Expand
  • 24
  • 3