Funding for this research was provided by:
World Anti-Doping Agency (17C09DL)
Ministerio de Educación, Cultura y Deporte (FPU14/06229)
Ministerio de Economía, Industria y Competitividad, Gobierno de España (PSI2016-75956-P)
Text and Data Mining valid from 2019-01-28
First Online: 28 January 2019
Compliance with Ethical Standards
: Darias Holgado, Thomas Zandonai and Daniel Sanabria are supported by a grant from the World Anti-Doping Agency (reference 17C09DL). In addition, Daniel Sanabria is supported by grant PSI2016-75956-P from the Spanish Ministerio de Economía, Industria y Competitividad, and Darías Holgado is supported by grant FPU14/06229 from the Spanish Ministerio de Educación, Cultura y Deporte.
: Darías Holgado, Thomas Zandonai and Daniel Sanabria have no conflicts of interest that are directly relevant to the content of this letter. The authors alone are responsible for the views expressed in this publication and they do not represent the decisions, policy or views of the World Anti-Doping Agency.