[1] UNIV CONNECTICUT, CTR HLTH, DEPT COMMUNITY HLTH & PSYCHIAT, FARMINGTON, CT 06032 USA
[2] BOSTON UNIV, UNIV PROF PROGRAM, BOSTON, MA 02215 USA
[3] UNIV CONNECTICUT, CTR HLTH, BIOSTAT RES CTR, FARMINGTON, CT 06032 USA
[4] STANFORD UNIV, DIV BIOSTAT, PALO ALTO, CA 94304 USA
[5] UNIV LONDON LONDON SCH HYG & TROP MED, LONDON WC1E 7HT, ENGLAND
[6] UNIV TEXAS, MED BRANCH, DEPT NEUROBIOL, GALVESTON, TX 77550 USA
[7] HARVARD UNIV, SCH MED, DEPT PSYCHIAT, BOSTON, MA 02115 USA
[8] HARVARD UNIV, SCH MED, DEPT MED, BOSTON, MA 02115 USA