This author has not been identified. Look up 'Sicun Duan' in GoogleThis author has not been identified. Look up 'Weidong Wang' in GoogleThis author has not been identified. Look up 'Sai Zhang' in GoogleThis author has not been identified. Look up 'Xi Yang' in GoogleThis author has not been identified. Look up 'Yu Zhang' in GoogleThis author has not been identified. Look up 'Guojun Zhang' in Google