Use of a medication control officer to reduce bias in a clinical trial: lessons learned from the scleroderma lung study by Hsu, Vivien M, Khanna, Dinesh, Smith, Edwin, Filemon, Tan, Whelton, Sean, Lopata, Mel, Davis, John C, Polito, Albert, Heck, Louis, Molitor, Jerry, Abeles, Micha, Granda, Jose, Korn, Joseph, Clements, Philip

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