This author has not been identified. Look up 'Ning Nan' in GoogleThis author has not been identified. Look up 'Qi Chen' in GoogleThis author has not been identified. It may be one of the following persons: Look up 'Yu Wang' in GoogleThis author has not been identified. Look up 'Xu Zhai' in GoogleThis author has not been identified. Look up 'Chuan-Ce Yang' in GoogleThis author has not been identified. Look up 'Bin Cao' in GoogleThis author has not been identified. Look up 'Tie Chong' in Google