Analysis of information sources in references of the Wikipedia article "多胞胎" in Chinese language version.
Note: They conducted a study by looking at the registered births of babies born with cerebral palsy during the periods of 1982-1989 in the counties of Merseyside and Cheshire.
Note: They conducted a study by looking at the registered births of babies born with cerebral palsy during the periods of 1982-1989 in the counties of Merseyside and Cheshire.