Background Obstructive sleep apnea hypopnea syndrome (OSAHS) is underdiagnosed.Screening patients at high risk of OSAHS is extremely important.Using the standard questionnaire to screen OSAHS is a practical method.T...
Background Obstructive sleep apnea hypopnea syndrome (OSAHS) is the most common sleep-disordered breathing and is still underdiagnosed.This study was designed to evaluate the value of the STOP-Bang questionnaire (...
Project supported by the National Natural Science Foundation of China(No.61074151);the National Key Technology R&D Program of China(Nos.2008BAG11B01 and 2009BAG12A10);the Research Fund of the State Key Laboratory of Rail Traffic Control and Safety(Nos.RCS2008ZZ003 and RCS2009ZT002);the Research Fund of Beijing Jiaotong University(No.2011YJS035),China
Line planning is the first important strategic element in the railway operation planning process,which will directly affect the successive planning to determine the efficiency of the whole railway system.A two-layer o...