Funding for this research was provided by:
Fresenius Kabi (Not applicable)
Received: 5 August 2018
Accepted: 29 October 2018
First Online: 8 November 2018
Ethics approval and consent to participate
: The manuscript is a systematic review and meta-analysis and as such data study reporting on published material. Therefore, no Ethics approval is required. The project was registered at PROSPERO, 22 July 2016, registration number CRD42016039539.
: As this is no clinical study but a report on data analysis on published material, consent to publish consent does not apply.
: The authors declare that they have no competing interests.
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