[1] Univ Technol Sydney, Fac Hlth, POB 123,15 Broadway, Ultimo, NSW 2007, Australia
[2] Univ Technol Sydney, Fac Hlth, Ctr Cardiovasc & Chron Care, Sydney, NSW 2007, Australia
[3] Univ Wollongong, Sch Nursing, Wollongong, NSW 2522, Australia
[4] Johns Hopkins Univ, Sch Nursing, Baltimore, MD 21205 USA