what are the different kinds of oxygen mask?
['Simple face mask.', 'Non re-breather face mask (mask with oxygen reservoir bag and one-way valves which aims to prevent/reduce room air entrainment)', 'Nasal prongs (low flow)', 'Tracheostomy mask.', 'Tracheostomy HME connector.', 'Isolette - neonates (usually for use in the Neonatal Intensive Care Unit only)']