Pladevall M, Arana A, Varas-Lorenzo C. Systematic reviews and meta-analyses in ischemic cardiopathy. Cardiovasc Risk Fact. 2000;4:270-81.
Pladevall-Vila M, Arana A, Varas-Lorenzo C. Systematic reviews and meta-analysis on coronary heart disease. (Revisiones sistemáticas y meta-análisis en cardiopatía isquemica). Cardiovasc Risk Fact. 2000;4:270-81.
Mansfield CA. A consistent method for calibrating contingent value survey data. South Econ J. 1998;64(3):665-81.