jChengdu Women's and Children's Central Hospital, Chengdu, China kQingdao Women and Children's Hospital, Qingdao, China lFoshan Women and Children Hospital, Foshan, China mThe International Peace ...

AIM To establish a reference range for serum cortisol concentrations in preterm infants with a gestational age of less than 30 weeks during the first two weeks of life. METHODS Infants were ...