Physician participation in research surveys. A randomized study of inducements to return mailed research questionnaires.Published in:1999By:Donaldson, G W;Moinpour, C M;Bush, N E;Chapko, M;Jocom, J;Siadak, M;Nielsen-Stoeck, M;Bradshaw, J M;Bichindaritz, I;Sullivan, K MPublication type:journal article