1. PhD Student, School of Nursing; Oregon Health & Science University; Mail code: SN-2N; 3455 SW US Veterans Hospital Road; Portland OR 97239-2941 USA
2. Research Fellow; Department of Biomedicine and Prevention; University of Rome Tor Vergata; Rome Italy
3. Associate Professor; School of Nursing; Oregon Health & Science University; Portland OR USA
4. Professor; School of Nursing; University of Pennsylvania; Philadelphia PA USA
5. Research Fellow; Faculty of Health Science; University of San Jorge; Zaragoza Spain
6. Research Associate; School of Nursing; Oregon Health & Science University; Portland OR USA
7. Research Associate; Department of Biomedicine and Prevention; University of Rome Tor Vergata; Rome Italy