What happened to Tiger Woods this week?

What happened to Tiger Woods this week? He was supposed to be playing in the Dubai Desert Classic. In fact, last week, during the Australian Masters, the commentators mentioned many times that Tiger's last tournament of the year would be this week's Dubai Desert Classic.

What about Tiger's own tournament every December, The Target World Challenge at Sherwood Country Club near Los Angeles? A month ago I predicted that Phil Mickelson would pass Tiger as the World's Number One player because Tiger was too preoccupied with outside interests.

Where is he this week?