title: Letters.
authors.affiliation: a Tempe , Arizona.
authors.forename: G L
authors.initials: GL
authors.lastname: Campbell
authors.affiliation: b Department of Family Medicine Medical College of Ohio Toledo.
authors.forename: J J
authors.initials: JJ
authors.lastname: Baum
authors.affiliation: c Department of Anesthesiology University of Florida College of Medicine Gainesville.
authors.forename: J H
authors.initials: JH
authors.lastname: Modell
authors.affiliation: d University Health Service University of Wisconsin-Madison.
authors.forename: P G
authors.initials: PG
authors.lastname: Hanson