CTA

English to Spanish Medical Medical: Pharmaceuticals Agreement for the rendering of services for a clinical trial

I have found this as "autorización para ensayos clínicos" or "acuerdos para ensayos clínicos", but in this case it refers to a resource.
Thank you!

Resource 2:
CRA 1 located in Mexico from Nov 2011 through June 2014
(2 sites in Colombia, 6 sites in Mexico)
Resource 3:
CRA 2 located in Mexico from Mar 2012 through May 2014
(2 sites in Colombia, 6 sites in Mexico)
Resource 4:
CTA located in Mexico from Nov 2011 through June 2014
(2 sites in Colombia, 6 sites in Mexico)
Resource 5:
CTA located in Brazil from Nov 2011 through May 2012