This author has not been identified. Look up 'Xiaojun Yan' in GoogleThis author has not been identified. Look up 'Jing Xu' in GoogleThis author has not been identified. Look up 'Yuanping Zhu' in GoogleThis author has not been identified. Look up 'Jiang Wang' in GoogleThis author has not been identified. It may be one of the following persons: Look up 'Yang Yang' in GoogleThis author has not been identified. Look up 'Cheng-Xiang Wang' in Google