[1] Univ Massachusetts, Sch Med, Dept Emergency Med, Worcester, MA USA
[2] Univ Massachusetts, Sch Med, Dept Psychiat, Worcester, MA 01655 USA
[3] Univ Massachusetts, Sch Med, Dept Quantitat Hlth Sci, Worcester, MA USA
[4] Worcester Polytech Inst, Dept Math, Worcester, MA 01609 USA
[5] Univ Colorado, Sch Med, Colorado Depress Ctr, Denver, CO USA
[6] Mental Illness Res Educ & Clin Ctr, Denver, CO USA