?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Pike&rft.au=Pike%2C+R&rft.aufirst=R&rft.date=11+April+2016&rft.atitle=PD1-Expressing+T+Cell+Subsets+Modify+the+Rejection+Risk+in+Renal+Transplant+Patients&rft.volume=7&rft.issn=1664-3224&rft.title=Frontiers+in+Immunology&rft.genre=article