sentences:  He received injuries to his head and successfully underwent surgery at Ullevål university hospital.Despite all his struggles he managed to come back to the ice, and was an important part of the success when the national team reached the quarter-finals at the 2008 IIHF World Championship in Canada.In November 2007 Myrvold told the Norwegian newspaper "Verdens Gang" that he had been abusing cocaine for a lengthy period of time.