1. Carmen Mabel Arroyo-Novoa is Associate Professor, Graduate Department, University of Puerto Rico School of Nursing, Medical Sciences Campus, PO Box 365067, San Juan, PR 00936-5067 (). Milagros I. Figueroa-Ramos is Associate Professor, Graduate Department, University of Puerto Rico School of Nursing, San Juan, Puerto Rico. Kathleen A. Puntillo is Professor Emeritus, Physiological Nursing Department, University of California, San Francisco, School of Nursing, San Francisco, California.