“…A number of studies have been excluded because of such factors as excessive inadequacy of follow-up, partial duplication of cases with others included in our table, failure to indicate type of treatment used, and other reasons which made the results useless from our point of view. Papers thus rejected are those by Thorley & Craske [37], Bennett and Semrad [2], H. I. Harris [19], Hardcastle [17], A. Harris [18], Jacobson and Wright [21], Friess and Nelson [14], Comroe [5], Wenger [38], Orbison [33], Coon and Raymond [6], Denker [8], and Bond and Braceland [3]. Their inclusion would not have altered our conclusions to any considerable degree, although, as Miles et al point out: "When the various studies are compared in terms of thoroughness, careful planning, strictness of criteria and objectivity, there is often an inverse correlation between these factors and the percentage of successful results reported" [31, p. 88].…”