[1] EP Bradley Hosp, Riverside, RI USA
[2] Brown Univ, Sch Publ Hlth, Providence, RI USA
[3] SUNY Buffalo, Buffalo, NY USA
[4] Med Univ South Carolina, Charleston, SC USA
[5] Univ Zurich, Personal Psychol, Zurich, Switzerland
[6] Brown Univ, Sch Publ Hlth, Ctr Alcohol & Addict Studies, Box S121-4, Providence, RI 02912 USA