 Complete the following phrase:  In 2009 he was found guilty of refusal to submit to doping control and tampering with a doping control. For this he received a two-year suspension from the sport, lasting from March 2009 to March 2011. He returned to competition in late 2011 to win the silver medal in 3000 m steeplechase at the 2011 Pan Arab Games. That year he also competed at the World Championships in Daegu, finishing 9th in the final. He reached the 