This author has not been identified. Look up 'Bingchao Xu' in GoogleThis author has not been identified. It may be one of the following persons: Look up 'Xiaofeng Wang' in GoogleThis author has not been identified. Look up 'Xiaorui Zhou' in GoogleThis author has not been identified. Look up 'Jianghuan Xi' in GoogleThis author has not been identified. Look up 'Shangping Wang' in Google