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Article History

Received: 24 October 2017

Accepted: 20 June 2018

First Online: 3 July 2018

Ethics approval and consent to participate

: The study was evaluated by the Spanish Agency for Medicine and Health Products and classified as a not post-commercialization observational study. This study was approved by the regional ethical committee of Andalusia at Hospital Universitario Virgen del Rocio (approval number 02/2014). Because of the retrospective nature of the study, the anonymization of data, and the lack of active research interventions, the need for informed consent was waived. The ethics committee was aware of these circumstances clearly explained in the protocol, and approved this procedure.

: Not applicable.

: The authors declare that they have no competing interests.

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