BUZZ-Valeant Pharmaceuticals International Inc: CEO on medical leave
** Embattled Canadian drugmaker's U.S.-listed shares down about 7 pct at $106.52 premarket
** Valeant says a group of company executives will take over in an interim capacity, until CEO Michael Pearson returns from medical leave
** Pearson was hospitalized with a "severe case of pneumonia" on Friday, a company spokeswoman said last week
** Valeant's board has created an "office of the Chief Executive Officer", which will include general counsel Robert Chai-Onn, group chairman Ari Kellen, and Chief Financial Officer Robert Rosiello
** Up to Thursday's close, stock had fallen about 20 pct this year
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