This author has not been identified. Look up 'Chenghua Li' in GoogleThis author has not been identified. Look up 'Chunjie Zhang' in GoogleThis author has not been identified. Look up 'Kun Ding' in GoogleThis author has not been identified. It may be one of the following persons: Look up 'Gang Li' in GoogleThis author has not been identified. Look up 'Jian Cheng' in GoogleThis author has not been identified. Look up 'Hanqing Lu' in Google