This author has not been identified. Look up 'Xin Huang' in GoogleThis author has not been identified. Look up 'Aijuan Li' in GoogleThis author has not been identified. It may be one of the following persons: Look up 'Zhen Huang' in GoogleThis author has not been identified. Look up 'Yi Sun' in GoogleThis author has not been identified. Look up 'Yumin Song' in GoogleThis author has not been identified. Look up 'Ning Xu' in Google