Wilson R D, Hogge W A, Golbus M S
J Reprod Med. 1987 Jan;32(1):25-7.
Analysis of patients who spontaneously aborted chromosomally normal pregnancies following chorionic villus sampling (CVS) revealed an overall loss rate of 5.4% but a rate of only 3.2% if the procedure was performed between 9 and 12 menstrual weeks. There is preliminary evidence to suggest that a small but significant risk of infection is related to CVS.
对绒毛取样（CVS）后自然流产染色体正常妊娠的患者进行分析发现，总体流产率为5.4%，但如果在月经周期的第9至12周进行该操作，流产率仅为3.2%。有初步证据表明，CVS存在小但显著的感染风险。
