1. Department of Communicative Disorders, University of Alabama, Speech and Hearing Center, Box 870242, Tuscaloosa, AL 35487-0242 USA
2. Department of Human and Family Development, University of Alabama, Tuscaloosa, AL, USA
3. Department of Nursing, University of Alabama, Tuscaloosa, AL, USA
4. Department of Psychology, Vanderbilt University, Nashville, TN, USA