Received: 16 February 2018
Accepted: 1 June 2018
First Online: 28 June 2018
Ethics approval and consent to participate
: Data on human cases were obtained from a database (CMBD-AP) held by the Health Department of the Catalan Government. Researchers can request data from CMBD-AP by filling and signing a form in which a signed Confidentiality Commitment is required. Data provided to researchers is anonymised. For these reasons, this study did not need individual ethics approval.
: The authors declare that they have no competing interests.
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