1. Department of Laboratory Medicine; West China Hospital; Sichuan University; Chengdu 610041 China
2. Department of Laboratory Medicine; People's Hospital of Tibet Autonomous region; Lhasa 850000 China
3. Department of Laboratory Medicine; Tibetan Hospital of Tibet Autonomous region; Lhasa 850000 China
4. Center of Laboratory Medicine; First Affiliated Hospital of Xinjiang Medical University; Urumchi 830054 China