Coaches and doctors that turn athletes to doping could face probation and jail.
'Fancy Bear' has been releasing details of athletes' Therapeutic Use Exemptions.
Sharapova can return on April 26.
Froome's former team mate Sir Bradley Wiggins has been caught up in the controversy.
Alleged Russian hackers have released confidential data of U.S. and U.K. athletes, including Bradley Wiggins and Venus and Serena Williams.
Several top athletes' medical data appeared on a hackers' website.
Chen Xinyi tested positive for an unnamed substance.
She will be 31 in two years—time enough for a comeback.
Vitaly Mutko apologizes and is 'ashamed' over doping scandal, which he blames on deceptive athletes.
Dr. Mark Bonar's allegations have shaken faith in U.K. anti-doping efforts.
Anti-doping bodies must become more accountable to the athletes they serve.