The doctors behind Health eHeart also hope to help solve the riddle of what causes atrial fibrillation, an irregular heartbeat that can lead to stroke and now affects more than three million Americans.

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The pair hold a one-stroke lead over compatriots Jim Furyk, Scott Verplank and D.

CNN: Woods misses cut as Americans dominate PGA leaderboard

The visitors took the lead on the stroke of half-time as Antony Sweeney coolly slotted past Rene Gilmartin.

BBC: Watford 4-1 Hartlepool