Unick JL, Beavers D, Bond DS, Clark JM, Jakicic JM, Kitabchi AE, Knowler WC, Wadden TA, Wagenknecht LE, Wing RR. The long-term effectiveness of a lifestyle intervention in severely obese individuals. Am J Med. 2013 Mar; 126(3):236-42, 242.e1-2.