TY - JOUR T1 - Hazard of yawning JF - Canadian Medical Association Journal JO - CMAJ SP - 15b LP - 15 VL - 142 IS - 1 AU - Y. Tesfaye AU - S. Lal Y1 - 1990/01/01 UR - http://www.cmaj.ca/content/142/1/15b.abstract ER -