Investigators were not blinded to the study group assignment, but caregivers responsible for the infants' care and for feeding protocol performance were not part of the investigation.
研究者知晓研究分组情况，但负责婴儿护理和喂养的人员不参与研究。
Investigators were not blinded to the study group assignment, but caregivers responsible for the infants' care and for feeding protocol performance were not part of the investigation.
研究者知晓研究分组情况，但负责婴儿护理和喂养的人员不参与研究。
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