Norway’s Jarl Magnus Riiber, the most successful Nordic combined athlete of all time, has announced he will retire at the end of the season and will not compete at next year’s Milan-Cortina Games. Riiber, 27, who has the overall Nordic combined record of 76 individual World Cup wins and eight world championships gold medals, was recently diagnosed with Crohn's disease, a chronic inflammatory condition in the digestive system. "That illness came as a bit of a surprise to me. I didn't understand