This author has not been identified. Look up 'Li-Xia Zhu' in GoogleThis author has not been identified. Look up 'Qin Liu' in GoogleThis author has not been identified. Look up 'Ya-Fang Hua' in GoogleThis author has not been identified. Look up 'Ning Yang' in GoogleThis author has not been identified. Look up 'Xue-Gang Zhang' in GoogleThis author has not been identified. Look up 'Xi Ding' in Google