1) Daniels M, Hill AB. Chemotherapy of pulmonary tuberculosis in young adults. An analysis of the combined results of three Medical Research Council trials. Br Med J 1952; 1: 1162-8.
2) Colloca L, Lopiano L, Lanotte M, Benedette F. Overt versus covert treatment for pain, anxiety, and Parkinson’s disease. Lancet Neurol 2004; 3: 679-84.