Data collection
SECONDARY, BLIND
The primary variables: OPLP (P1) obtained by traditional blind insertion manoeuvre and the OPLP (P2) obtained by up-down optimized glottic exposure manoeuvre. The secondary variables: the glottic exposure grading (V1) with traditional blind insertion manoeuvre and the glottic exposure grading (V2) with up-down optimized glottic exposure manoeuvre.