This author has not been identified. Look up 'An Liu' in GoogleThis author has not been identified. It may be one of the following persons: Look up 'Hai Liu' in GoogleThis author has not been identified. Look up 'Qing Li' in GoogleThis author has not been identified. Look up 'Liusheng Huang' in GoogleThis author has not been identified. Look up 'Mingjun Xiao' in Google