Randomized trial of weekly, twice-monthly, and monthly interpersonal psychotherapy as maintenance treatment for women with recurrent depression. - Frank E; Kupfer DJ; Buysse DJ; Swartz HA; Pilkonis PA; Houck PR; Rucci P; Novick DM; Grochocinski VJ; Stapf DM; Frank, Ellen; Kupfer, David J; et al. (American Journal of Psychiatry, 2007)