400
Participants
Start Date
January 1, 2015
Primary Completion Date
December 31, 2017
Study Completion Date
December 31, 2017
surfactant
Pulmonary surfactant was administrated if the baby was diagnosed with respiratory distress syndrome
the first people hospital of Tibet autonomous region
UNKNOWN
the second people hospital of Lasa
UNKNOWN
the first people hospital of Shigatse
UNKNOWN
the first people hospital of Lasa
UNKNOWN
the people hospital of Linzhi
UNKNOWN
the people hospital of Laqu
UNKNOWN
Shannan People's Hospital
OTHER
the people hospital of Changdu
UNKNOWN
the people hospital of Ali
UNKNOWN
the second people hospital of Tibet autonomous region
UNKNOWN
Women and Children Hospital of Qinghai Province
OTHER
Daping Hospital and the Research Institute of Surgery of the Third Military Medical University
OTHER