1. College of Nursing, Chungnam National University, Daejeon, The Republic of Korea.
2. Department of Biobehavioral Nursing Science, University of Florida College of Nursing, Gainesville, Florida, USA.
3. Department of Pathology, Immunology and Laboratory Medicine, University of Florida College of Medicine, Gainesville, Florida, USA.
4. Department of Mathematics and Statistical Science, University of Idaho College of Science, Moscow, Idaho, USA.