Development of Alive! (A Lifestyle Intervention Via Email), and its effect on health-related quality of life, presenteeism, and other behavioral outcomes: randomized controlled trial.
Block G, Sternfeld B, Block CH, Block TJ, Norris J, Hopkins D, Quesenberry CP Jr, Husson G, Clancy HA. J Med Internet Res. 2008 Nov 19; 10(4):e43. Epub 2008 Nov 19.