Carvalho, W. B. de; Silva, P. S. L. da; Chiu, S. T. P.; Fonseca, M. M. C.; Belli, L. A. Comparison Between the Comfort and Hartwig Sedation Scales in Pediatric Patients Undergoing Mechanical Lung Ventilation. Sao Paulo Med J 1999, 117, 192-196.