1. Shaanxi Engineering and Technological Research Center for Conversation and Utilization of Regional Biological Resources, College of Life Sciences, Yan'an University, Yan'an, China.
2. Yan'an University Affiliated Hospital, Yan'an, China.
3. Yan'an Second People's Hospital, Yan'an, China.
4. Department of Pathogenic Biology, School of Basic Medical Sciences, Gannan Medical University, Ganzhou, China.