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These are outstanding review (see especially Chapter 6 for great tips).
Mask Ventilation [Video], Dr. Robert Pascussi
Chapter 1: Introduction 1:38
Chapter 2: Positioning an Infant 2:30
Chapter 3: Oral Airway 1:34
Chapter 4: Nasal Airway 1:22
Chapter 5: Positioning an Older Child: 2:43
Chapter 6: Failure to obtain tight seal by mask: 3:55