. . . . . . . . . . . "Comparability of diagnostic data : coded by the 8th and 9th revisions of the International classification of diseases" . . . . . . "Comparability of diagnostic data : coded by the 8th and 9th revisions of the International Classification of Diseases" . . . . . . . "Hospitals utilization United States." . . "Disease classification United States Statistics." . . "Ambulatory Care United States Statistics." . . . . "Patient Discharge United States Statistics." . .