2013;41:82-7. * Corresponding author at: Department of Anesthesiology, ShanDong Provincial Hospital Affiliated to ShanDong University, 324 Jing-wuweiqilu, Jinan 250021, China.
Departamento de Anestesiología, Hospital de la Provincia de ShanDong, afiliado a la Universidad de Shan- Dong, 324 Jingwuweiqilu, Jinan, R.P. de China, 250021.