prior events. In collaboration with the IAAF Athletes' Commission, an athlete education and support site was set up in Doha: the Athletics Integrity Hub. The hub provided information on anti-doping and also support for reporting of illegal gambling, bribery and corruption, harassment and abuse. The Russian Athletics Federation was excluded from the World Championships for a second time running as it remained suspended by the IAAF due to systemic doping. The Russian Federation had failed to gain reinstatement that year because tests from the Russian Anti-Doping Agency's Moscow laboratory indicated evidence of manipulation. Russian athletes had to apply to the IAAF to compete under the Authorised Neutral Athlete scheme. Although not nationally suspended, Kenya came under scrutiny for a culture of doping, with Brett Clothier of the Athletics Integrity Unit stating that "EPO is readily available and everyone knows where to get it and how to use it" in a documentary released by German broadcaster ZDF shortly before the World Championships. The world leader in the men's 100 metres, Christian Coleman, was suspended by the United States Anti-Doping Agency (USADA) after missing three out-of-competition tests within a 12-month period, but successfully appealed a ban on a technicality of the test dates and gained entry to the competition. During the championships, the USADA issued a four-year ban for doping violations to Alberto Salazar, head coach of the Nike Oregon Project – a training group that included several athletes who would go on to medal at the championships. Dilshod Nazarov, the reigning Olympic champion in the men's hammer throw and also president of the Tajikistan Athletics Federation, was banned shortly before the competition, after retesting of a sample from the 2011 World Championships in Athletics showed metabolites of Turinabol. Other athletes suspended on anti-doping grounds shortly before the championships were the 2015 women's 800 m world champion Maryna Arzamasova, 2019 Pan American Games women's discus silver medallist Andressa de Morais, the 2018 Commonwealth Games women's 100 m champion Michelle-Lee Ahye, African sprint medallist Carina Horn and Asian long-distance medallist Albert Rop. Due to the re-analysis of samples taken from previous championships, 13 current and former athletes received their world championship medals during the championships. Marija Šestak received her triple jump bronze medal from the 2007 World Championships. Oleksiy Kasyanov, Antonietta Di Martino and Naide Gomes received their bronze medals from the 2009 World Championships. Habiba Ghribi received her 3000-meter steeplechase gold medal