This author has not been identified. Look up 'Lijun Sun' in GoogleThis author has not been identified. It may be one of the following persons: Look up 'Xiaodong Liu' in GoogleThis author has not been identified. Look up 'Tianfei Chen' in GoogleThis author has not been identified. Look up 'Ming Yan' in GoogleThis author has not been identified. Look up 'Shaokui Ma' in Google