[1] Johns Hopkins Univ, Sch Nursing, Baltimore, MD 21218 USA
[2] Wayne State Univ, Detroit, MI 48202 USA
[3] Augsburg Coll, Minneapolis, MN USA
[4] Univ Med & Dent New Jersey, Newark, NJ 07103 USA
[5] Univ Michigan Flint, Flint, MI USA
[6] Middlesex Univ, Sch Hlth & Social Sci, London N17 8HR, England