The researchers from the London School of Hygiene and Tropical Medicine carried out their study on 603 British women aged 18 to 55 who had miscarried within three months of getting pregnant.

• 伦敦卫生及热带医学院的研究人员对603名年龄在18至55岁之间的英国女性进行了调查，这些女性均有怀孕前三个月内流产的经历。