Timing of tracheal intubation: monitoring the orbicularis oculi, the adductor pollicis or use a stopwatch? - Koscielniak-Nielsen ZJ,null.; Horn A,null.; Sztuk F,null.; Eriksen K,null.; Skovgaard LT,null.; Viby Mogensen J,null. (Eur. J. Anaesthesiol., 1996)