On this encore edition of ST Medical Monday, our guest is F. Diane Barth, a longtime psychotherapist based in New York City. She joins us to discuss her book, "I Know How You Feel: The Joy and Heartbreak of Friendship in Women's Lives." As was noted of this readable and useful study by Kirkus Reviews: "A psychotherapist offers advice about how to be, and keep, a friend. Barth, whose Psychology Today blog frequently focuses on women's friendships, draws on interviews with diverse women to examine the 'magical, meaningful, and surprisingly difficult' connections they make with friends."