Behind Bethanie Mattek-Sands’s Drug-Use Exemption, Questions About Her Doctor. World Anti-Doping Agency, Rothenberg, Ben, Tennis, Mattek-Sands, Bethanie, Steroids, DHEA (Dihydroepiandrosterone) (Hormone), Court of Arbitration for Sport, International Tennis Federation, Cyberwarfare and Defense, Russia, Doping (Sports)