CJCP     2012 14 (12):  960-963    ISSN: 1008-8830  CN: 43-1301/R A family-based transmission disequilibrium test of polymorphisms of endothelial nitric oxide synthase gene in children with orthostatic intolerance XIONG Zhen-Yu, HAN Zi-Yan, HAN Zhen-Hui, ZHANG Xi, GAO Xi-Qing, GAI Yong, LIAN Jie Department of Cardiology, Kaifeng Children's Hospital, Kaifeng, Henan 475000, China. kfxzhy@126.com Received: null  Revised: null  Online: null Supporting info