[1] Cornell Univ, Weill Med Coll, Dept Psychiat, Intervent Res Ctr Late Life Mood Disorders, White Plains, NY 10605 USA
[2] Univ Pittsburgh, Sch Med, Dept Psychiat, Intervent Res Ctr Late Life Mood Disorders, Pittsburgh, PA 15260 USA
[3] Univ Penn, Sch Med, Dept Psychiat, Intervent Res Ctr Late Life Mood Disorders, Philadelphia, PA 19104 USA