1. Institute of Tibetan medicine, University of Tibetan Medicine, Lhasa, Tibet Autonomous Region 850007, P.R. China
2. Nuclear Medicine Department, General Hospital of Tibet Military Area Command, Lhasa, Tibet Autonomous Region 850000, P.R. China
3. Clinical Biochemistry Laboratory, Army Medical University (Third Military Medical University), Chongqing 400038, P.R. China