Internal versus external motivation in referral of primary care patients with depression to an internet support group: randomized controlled trial.
Van Voorhees BW, Hsiung RC, Marko-Holguin M, Houston TK, Fogel J, Lee R, Ford DE. Internal versus external motivation in referral of primary care patients with depression to an internet support group: randomized controlled trial. J Med Internet Res. 2013 Mar 12; 15(3):e42.