Text and Data Mining valid from 2016-02-15
Received: 11 January 2016
Accepted: 23 January 2016
First Online: 15 February 2016
Compliance with ethical standards
: MDS and AC received travel support from Actelion. The other authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
: All subjects enrolled signed a written informed consent for serum samples and data analysis after approval from the local ethical committee.