1Professor, Department of Nursing, Konkuk University, Chungju, Korea.
2Professor, Department of Nursing, Chung-Ang University, Seoul, Korea.
3Assistant Professor, Department of Nursing, Baekseok University, Cheonan, Korea.
© 2012 Korean Society of Nursing Science
NA=No answer; Var=Variables.
NA=No answer; Var=Variables.