[1] Univ Arkansas Med Sci, Coll Nursing, Little Rock, AR 72205 USA
[2] Univ Penn, Sch Nursing, Philadelphia, PA 19104 USA
[3] Univ Penn, Dept Otorhinolaryngol Head & Neck Surg, Fac 2, Philadelphia, PA 19104 USA
[4] Oregon Hlth Sci Univ, Sch Nursing, Portland, OR 97201 USA
[5] Univ Calif San Francisco, Sch Nursing, Gerontol Program, San Francisco, CA 94143 USA
[6] Univ Iowa 436B, Coll Nursing, Iowa City, IA USA