2,200
Participants
Start Date
February 1, 2020
Primary Completion Date
April 15, 2021
Study Completion Date
April 15, 2021
no intervention
it's only observational study. No interventions.
People's Hospital of Golog Tibetan Autonomous Prefecture, Guoluo Prefecture
Hainan women and children medical center, Haikou
Yan'an Hospital Affiliated to Kunming Medical University, Kunming
Tibet Autonomous People's Hospital, Lhasa
People's Hospital of Luchun County, Yunnan Province, Luchun
People's Hospital of Naqu District, Tibet, Naqu
Qinghai Red Cross Hospital, Qinghai
People's Hospital of Xinjiang Uygur Autonomous Region, Ürümqi
Hainan women and children medical center
UNKNOWN
People's Hospital of Xinjiang Uygur Autonomous Region
OTHER
Yan'an Affiliated Hospital of Kunming Medical University
OTHER
Qinghai Red Cross Hospital
OTHER
Tibet Autonomous Region People's Hospital
OTHER
People's Hospital of Golog Tibetan Autonomous Prefecture
UNKNOWN
People's Hospital of Naqu District, Tibet
UNKNOWN
People's Hospital of Luchun County, Yunnan Province
UNKNOWN
Children's Hospital of Fudan University
OTHER