This study was supported by the Maternal and Child Health Bureau, Health Resources and Service Administration, and the U. s. Department of Health and Human Services.
这项研究得到妇幼保健署，卫生资源和服务部，以及美国卫生及人力服务署资助。
This study was supported by the Maternal and Child Health Bureau, Health Resources and Service Administration, and the U. s. Department of Health and Human Services.
这项研究得到妇幼保健署，卫生资源和服务部，以及美国卫生及人力服务署资助。
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