1. Department of Science and Environmental Studies, Faculty of Arts and Sciences, The Hong Kong Institute of Education, Tai Po, Hong Kong S.A.R., People’s Republic of China
2. Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong S.A.R., People’s Republic of China
3. Department of Physics, Anhui Normal University, Wuhu, Anhui 241000, People’s Republic of China