Tiger Woods has had a follow-up procedure on his back, a month after undergoing surgery for the second time in a year and a half, the former world number one said on Friday. "It's one of those things that had to be done," Woods said on his website. "I have an outstanding team of doctors, and I'll be back as soon as I can." Woods, who has slipped to 351st in the world, had microdiscectomy surgery in March 2014 and again on Sept. 16 this year to correct a disk fragment pinching a nerve. More...