Prenasal thickness to nasal bone length ratio in normal and trisomy 21 fetuses at 11–14 weeks of gestation 期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Prenasal thickness to nasal bone length ratio in normal and trisomy 21 fetuses at 11–14 weeks of gestation

摘要：