1. State Key Laboratory of Tree Genetics and Breeding, Key Laboratory of Tree Breeding and Cultivation of State Forestry Administration, Research Institute of Forestry, Chinese Academy of Forestry, Beijing, China
2. Institute of Apicultural Research, Chinese Academy of Agricultural Sciences, Beijing, China
3. Risk Assessment Laboratory for Bee Products, Quality and Safety of Ministry of Agriculture, Beijing, China
4. Research Institute of Forest Ecology, Environment and Protection, Key Laboratory of Forest Ecology and Environment of State Forestry Administration, Chinese Academy of Forestry, Beijing, China