1. Institute of Apicultural Research, Chinese Academy of Agricultural Sciences, Beijing, 100093, P. R. China
2. School of Life Sciences, University of Sussex, Brighton, BN1 9QG, United Kingdom
3. Laboratory of Risk Assessment for Quality and Safety of Bee Products, Ministry of Agriculture, Beijing, 100093, P. R. China
4. Key Laboratory of Bee Products for Quality and Safety Control, Ministry of Agriculture, Beijing, 100093, P. R. China
5. Bee Product Quality Supervision and Testing Centre, Ministry of Agriculture, Beijing, 100093, P. R. China