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Recommendations are categorized according to the following designations:
Category IA: Strongly recommended for implementation and strongly supported by well-designed experimental, clinical, or epidemiological studies.
Category IB: Strongly recommended for implementation and supported by some experimental, clinical, or epidemiological studies and a strong theoretical rationale.
Category IC: Required by state or federal regulations, rules, or standards.
(The acronym of the promulgating federal agency is listed in parentheses when the statement is derived from a regulation. When a statement refers to regulation at the state level, the word "states" appears in parentheses.)
Category II: Suggested for implementation and supported by suggestive clinical or epidemiological studies or a theoretical rationale.
No recommendation: Unresolved issue. Practices for which insufficient evidence or no consensus regarding efficacy exists.