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By David Henry TAMPA, Florida (Reuters) - Jamie Dimon, JPMorgan Chase & Co's outspoken chairman and chief executive, won a vote of confidence on Tuesday as shareholders decided to let him keep his chairman title by an even greater margin than last year. Dimon could not claim total victory at the bank's annual meeting. Three JPMorgan directors were re-elected by a slim majority, an unusual outcome. The three directors were on the board's risk management committee, which is widely seen as having fallen down after the bank lost $6.2 billion from risky derivatives trades last year. ...