1 Department of Anaesthesiology, The University of Auckland, Auckland, New Zealand; Surf Life Saving New Zealand, Wellington, New Zealand; International Drowning Research Alliance. Electronic address: jweb018@aucklanduni.ac.nz.
2 Department of Emergency Medicine, University of Florida College of Medicine-Jacksonville, Jacksonville, Florida; Lifeguards Without Borders, Carolina Beach, North Carolina; International Drowning Research Alliance.
3 Lifeguards Without Borders, Kuna, Idaho; International Drowning Research Alliance.
4 Sociedade Brasileira de Salvamento Aquático, Rio de Janeiro, Brazil; International Drowning Research Alliance.
5 EPI-Unit, Institute of Public Health, University of Porto, Porto, Portugal; International Drowning Research Alliance.