Application and  effectiveness evaluation of nasotracheal 
intubation using lightwand in patients with difficult
 airways during intubation 
DONG Ying-chun,SHAO Yun,SU Rong-xiang,WU Wei-mei,LI Gang 
Journal of Jilin University(Medicine Edition) . 2013, (3): 592 -596 .  DOI: 10.7694/jldxyxb20130335