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He "was exhausted and suffers from a sleeping disorder," his rep tells TMZ.com. "He went in voluntarily to get some help."
Chambers plays Dr. Alex Karev on the ABC drama.
The UCLA Medical Center is the same facility where Britney Spears is currently under a 72-hour psychiatric hold.
JOSH & FERGIE: ROCKED BY SCANDAL
Did he cheat with a stripper?
Married less than a year, the couple denies an Atlanta woman’s claims that she and Josh had a fling
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