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. 2018 Jan 10;18:21. doi: 10.1186/s12884-017-1648-2

Table 2.

Quality assessment tool

++ All or most checklist criteria is met, and where have not been met conclusions are unlikely to altar.
+ Some of the checklist criteria have been met, where they have not been met or not adequately described, conclusions are unlikely to altar.
Few or no checklist criteria have been met and conclusions are likely or very likely to alter.