By vgreene, 6 January, 2015 C:Requires further investigation; no adequate supporting Class I or II studies
By vgreene, 6 January, 2015 B:May be acceptable; based on supporting Class II studies and/or robust supporting Class III studies
By vgreene, 6 January, 2015 A:Accepted practice; based on supporting Class I studies and/or robust supporting Class II studies