Ren Yanhong, Qin Xiaoqun, Guan Chaxiang, Luo Ziqiang, Zhang Changqing, Sun Xiuhong. Temporal and spatial distribution of VIP, CGRP and their receptors in the development of airway hyperresponsiveness in the lungs. Acta Physiol Sin 2004; 56 (2): (in Chinese with English abstract).