Question: What's the birth year of the athlete that Niels do Vos used as an example for why athletes should be banned for using banned substances?

Context articles: Bjarne Riis
Tameka Williams
Justin Gatlin
List of doping cases in athletics
Performance-enhancing substance
Callum Priestley
Niels de Vos
List of drugs banned by WADA
Seven Deadly Sins: My Pursuit of Lance Armstrong
Víctor Castillo

Bjarne Lykkegård Riis (born 3 April 1964), nicknamed "The Eagle from Herning" (Danish: "Ørnen fra Herning" ), is a Danish former professional road bicycle racer who placed first in the 1996 Tour de France.
 For many years he was the owner and later manager of Russian UCI WorldTeam Tinkoff–Saxo .
 Other career highlights include placing first in the Amstel Gold Race in 1997, multiple Danish National Championships, and stage wins in the Giro d'Italia.
 On 25 May 2007, he admitted that he placed first in the Tour de France using banned substances, and he was no longer considered the winner by the Tour's organizers.
 In July 2008, the Tour reconfirmed his victory but with an asterisk label to indicate his doping offences.
Tameka Williams is a sprinter from St Kitts and Nevis.
 In 2012, she was banned from the Olympic Games for doping offenses.
 She was set to compete in the Women's 100m and the Women's 200m.
 Williams admitted to having injected "Blast Off Red", a performance-enhancing drug used on race animals.
 She has denied taking any illegal substances, what she injected was not listed under the World Anti-Doping Agency banned substances; however the material falls by being under the category of veterinary medicine on the prohibited list.
Justin Gatlin (born February 10, 1982) is an American track and field sprinter who specializes in the 100 and 200 metres events.
 He is the 2004 Olympic champion in the 100 metres, the 2005 and 2017 World champion in the same event, and the 2005 World champion in the 200 metres.
The use of performance-enhancing drugs (doping) is prohibited within the sport of athletics.
 Athletes who are found to have used such banned substances, whether through a positive drugs test, the biological passport system, an investigation or public admission, may receive a competition ban for a length of time which reflects the severity of the infraction.
 Athletes who are found to have banned substances in their possession, or who tamper with or refuse to submit to drug testing can also receive bans from the sport.
 Competitive bans may also be given to athletes who test positive for prohibited recreational drugs or stimulants with little performance-enhancing effect for competitors in athletics.
 The sports body responsible for determining which substances are banned in athletics is the World Anti-Doping Agency (WADA).
Performance-enhancing substances, also known as performance-enhancing drugs (PED), are substances that are used to improve any form of activity performance in humans.
 A well-known example involves doping in sport, where banned physical performance–enhancing drugs are used by athletes and bodybuilders.
 Athletic performance-enhancing substances are sometimes referred to as ergogenic aids.
 Cognitive performance-enhancing drugs, commonly called nootropics, are sometimes used by students to improve academic performance.
 Performance-enhancing substances are also used by military personnel to enhance combat performance.
Callum Priestley (born 13 February 1989) is a British former track and field athlete who specialised in sprint hurdling.
 He was banned after a positive sample for banned substances, namely clenbuterol, was found in a urine sample whilst training with the UK team in South Africa in January 2010.
 Despite evidence of tainted food, the ban was upheld.
 Subsequent to the ban, Priestley retired from competitive athletics.
Niels de Vos is a British sports businessman and chief executive.
 He attended King Edward's School, Birmingham.
 De Vos came to prominence as the Chief Executive of Sale Sharks, a professional rugby union club.
 De Vos helped the club move to a larger stadium in 2003, leaving Heywood Road in favour of Edgeley Park.
 In January 2007 he became the Chief Executive of the sporting governing body UK Athletics.
 De Vos modernised the athletics body, cutting jobs and aiming to move sponsorship money away from headquarters costs and towards training centres athletics club.
 De Vos also cut down the number of athletes going to the 2008 Beijing Olympics, minimising the number to those who would still be young enough to perform at the 2012 London Olympics.
 He has a strong anti-doping stance, favouring a lifetime ban for athletes caught using banned substances.
 After attempting to ban Dwain Chambers from an athletics comeback, he underlined the damage Justin Gatlin caused to United States athletics as an example for his reasoning.
This list of drugs banned by WADA is determined by the World Anti-Doping Agency, established in 1999 to deal with the increasing problem of doping in the sports world.
 The banned substances and techniques fall into the following categories: androgens, blood doping, peptide hormones, stimulants, diuretics, narcotics, and cannabinoids.
Seven Deadly Sins: My Pursuit of Lance Armstrong is a 2012 book written by the "Sunday Times" journalist David Walsh.
 In the book, Walsh writes about his 13-year fight to bring out the truth behind American cyclist Lance Armstrong's seven Tour de France wins, i.e. that Armstrong had used banned substances.
 Walsh was vindicated when Armstrong was stripped of all seven of his Tour titles, and banned from cycling for life, on October 22, 2012.
 Armstrong's seven Tour wins have been described as his "Seven Deadly Sins."
Víctor Manuel Castillo Petit (born 8 June 1981) is a Venezuelan track and field athlete who specialises in the long jump.
 His personal best jump is 8.34 metres, a Venezuelan record achieved in May 2004 in Cochabamba.
 He received a lifetime ban from athletics after testing positive for banned substances in 2011, having already served a two-year doping suspension from 2006.