title: Letters.
authors.affiliation: a Physical Therapy Department University of Wisconsin-La Crosse.
authors.forename: G J
authors.initials: GJ
authors.lastname: Davies
authors.affiliation: b Department of Physical Education The University of Connecticut Storrs.
authors.forename: J
authors.initials: J
authors.lastname: Billing
authors.affiliation: c San Pablo , California.
authors.forename: J R
authors.initials: JR
authors.lastname: Mariotti
authors.affiliation: d Biomechanics/Physical Education University of Oklahoma Norman.
authors.forename: G
authors.initials: G
authors.lastname: Shierman
authors.affiliation: e Salerno , Italy.
authors.forename: A
authors.initials: A
authors.lastname: Keys
authors.affiliation: f Off Belay The Mountain Magazine Renton , Washington.
authors.forename: R
authors.initials: R
authors.lastname: Smutek
authors.affiliation: g Physical Education and Recreation for the Handicapped Washington , DC.
authors.forename: J U
authors.initials: JU
authors.lastname: Stein