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Strength of recommendations
| A, Strongly recommend performing the clinical action |
| B, Recommend performing the clinical action |
| C1, The clinical action may be considered although there is a lack of high-level scientifi c evidence for its use. May be useful |
| C2, Clinical action not defi nitively recommended because of insuffi cient scientifi c evidence. Evidence insuffi cient to support or deny usefulness |
| D, Recommend not performing the clinical action |
