title: Letters.
authors.affiliation: a Jamaica Estates , New York.
authors.forename: A
authors.initials: A
authors.lastname: Afalonis
authors.affiliation: b New York.
authors.forename: H
authors.initials: H
authors.lastname: Kraus
authors.affiliation: c Head Athletic Trainer Philadelphia Eagles.
authors.forename: O
authors.initials: O
authors.lastname: Davis
authors.affiliation: d Ocean HBO Center Lauderdale-by-the-Sea , Florida.
authors.forename: R A
authors.initials: RA
authors.lastname: Neubauer
authors.affiliation: e Milwaukee County Hyperbaric Oxygen Unit Milwaukee.
authors.forename: E
authors.initials: E
authors.lastname: End
authors.affiliation: f NATA Greenville , North Carolina.
authors.forename: F
authors.initials: F
authors.lastname: George
authors.affiliation: g Phoenix , Arizona.
authors.forename: F W
authors.initials: FW
authors.lastname: Furth
authors.affiliation: h Medical Services Mead Johnson Research Center Evansville , Indiana.
authors.forename: M R
authors.initials: MR
authors.lastname: Davidson