If {TAIL ~ an alternative mask} is utilized, having a mask exhaust valve 62 , {HEAD ~ the stimulus} is directed to the patient will provide a reminder for the patient to check whether the exhaust valve 62 is blocked against a pillow or clothing 
If { TAIL ~ an alternative mask } is utilized , having a mask exhaust valve 62 , { HEAD ~ the stimulus } is directed to the patient will provide a reminder for the patient to check whether the exhaust valve 62 is blocked against a pillow or clothing
OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH