“…Some articles involving quality of care contrast different levels of providers. For example Sox (1979) reviewed four studies (Fine and Silver, 1973;Greenfield, Friedland, Scifers, Rhodes, Black and Komaroff, 1974;Ott, Bellaire, Machotka and Moon, 1974;Russo, Gururaj, Bunye, Kim and Ner, 1975) which assessed quality of care by different levels of providers. Other authors have done similar analyses (Goldberg, Jolly, Hosek and Chu, 1981; Powers, Jdowiec and Reichelt, 1984; Ramsay, McKenzie and Fish, 1982).…”