Affiliation: | 1. Pan-Asia Business School, Yunnan Normal University, Kunming, PR China;2. Department of Mathematics and Statistics, University of New Brunswick, Fredericton, E3B 5A3, Canada;1. Dipartimento di Strutture per l''Ingegneria e l''Architettura, Università di Napoli Federico II, Napoli, Italy;2. Department of Public Health and Primary Care, University of Cambridge, Institute of Public Health, Cambridge, UK |