Randomized controlled trial of a positive affect intervention to reduce stress in people newly diagnosed with HIV; protocol and design for the IRISS study oleh Moskowitz JT, Carrico AW, Cohn MA, Duncan LG, Bussolari C, Layous K, Hult JR, Brousset A, Cotten P, Maurer S, Pietrucha ME, Acree M, Wrubel J, Johnson MO, Hecht FM, Folkman S