[1] St Louis Univ, Div Hematol & Oncol, St Louis, MO 63103 USA
[2] Spire Gatwick Park Hosp, Dept Nursing, Horley, England
[3] Univ Essex, Dept Hlth, Colchester, Essex, England
[4] Dana Farber Canc Inst, Phyllis F Cantor Ctr Res Nursing & Patient Care, Boston, MA 02115 USA
[5] Harvard Med Sch, Boston, MA 02115 USA
[6] Univ Coll Hosp, Perioperat Nursing Sch, Ibadan, Nigeria