'Armstrong case tip of iceberg'
The head of the World Anti-Doping Agency says the Lance Armstrong case is just part of a wide-ranging doping battle that will never be completely won.
Speaking at a conference on how to increase cooperation between the pharmaceutical industry and anti-doping bodies, Wada president John Fahey said "bubbling away below the surface there are still problems that could surface at any time."
The US Anti-Doping Agency accused Armstrong of helping run the most sophisticated doping programme in sports within his US Postal Service and Discovery Channel teams.
USADA ordered Armstrong banned from the sport for life and stripped him of his seven Tour de France titles - a decision later ratified by the International Cycling Union.