This author has not been identified. Look up 'Pingping Dong' in GoogleThis author has not been identified. Look up 'Kai Gao' in GoogleThis author has not been identified. Look up 'Jingyun Xie' in GoogleThis author has not been identified. Look up 'Wensheng Tang' in GoogleThis author has not been identified. Look up 'Naixue Xiong' in GoogleThis author has not been identified. Look up 'Athanasios V. Vasilakos' in Google