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There are well-documented disparities in the number of minority groups' scientists -- such as female and racial minority communities' researchers -- mentioned in scientific outputs. These disparities might be the result of productivity differences (contribution), or they might be due to minority groups' contributions not being acknowledged (attribution). We consider scientists contributing to systematic reviews of healthcare interventions published by Cochrane and leverage a unique attribution of credit guidance to explore whether deserving scientists are properly credited in the reviews' acknowledgements (potential omission bias in the acknowledgements). We document some disparities in the attribution of credit in this setting, providing evidence that the lack of recognition of minority groups' scientists is also noticeable through omission bias in the acknowledgements. [ABSTRACT FROM AUTHOR]