Crown-rump length measurements revisited
European Journal of Obstetrics & Gynecology and Reproductive Biology（1990）
摘要
Clinical and ultrasound data of 403 first-trimester pregnancies were collected prospectively. For our CRL study, two groups of patients were selected: Group A with an optimal (menstrual) history (111 patients, 156 CRL measurements) and Group B with available BBT charts (17 patients, 27 CRL measurements).
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关键词
Ultrasound,Crown-rump length
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