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.
The visitors took the lead on the stroke of half-time as Antony Sweeney coolly slotted past Rene Gilmartin.
McIlroy, looking confident, held a four-stroke lead heading into Sunday's final round but self-destructed on the back nine.
An irregular heartbeat, known as atrial fibrillation, can also lead to ischaemic stroke.
Furyk began the day with a one-stroke lead over Carl Paulson and promptly bagged three birdies in an outward 33.
But Rangers were growing in confidence and they extended their lead on the stroke of half time with a fabulous goal.
With a one-stroke lead, he was trying to hit a scramble shot to save par and win his first major championship.
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The pair shot seven-under-par 65s to lead by a stroke from a group which includes Raul Ballesteros, the nephew of Seve Ballesteros.
McDowell dropped four shots from the ninth, including a bogey at the short 17th, but took a one-stroke lead down the par-five last.
The 60, with 10 birdies and an eagle 3 at the 542-yard seventh, gave Bradley a three-stroke lead over 2011 Masters champion Charl Schwartzel.
The visitors regained the lead on the stroke of half-time when Martin Gleeson went over from Westwood's pass and Chris Hicks added the goal.
Fuller almost doubled Stoke's lead on the stroke of half-time when he got the better of Curtis Davies to meet another Delap howitzer throw and nodded just wide.
Stallings had a 6-under 29 on the front nine, one off the course record, and was 13 under with a one-stroke lead when he got the 428-yard 15th hole.
Meanwhile at the Dubai Desert Classic, Britain's Stephen Gallacher will take a three-stroke lead into Sunday's final round after completing a stunning 10-under par round of 62 on Saturday.
Cabrera may long regret an ill-advised gamble on 13, when he held the lead by a stroke but tried to reach the green in two on the 510-yard par 5.
Germany's Bernhard Langer claimed fourth place after a second successive 65 which left him one shot off the lead and one stroke ahead of fifth-placed Sam Torrance (67) .
Motherwell took the lead on the stroke of half-time when Hateley delivered a searching free-kick that was nodded down by Loovens for Reynolds to shoot past Boruc from six yards.
Earlier, Scotland's Marc Warren had held a two-stroke lead with three holes to play, but a three-putt contributed to a double bogey at the 16th which he followed with a bogey at the 17th.
Sixth-placed City welcomed back Brazil star Robinho after three months out injured, and took the lead on the stroke of halftime when defender Anthony Gardner headed a 20-yard shot from Shaun Wright-Phillips into the net.
Tevez doubled the lead on the stroke of halftime, the Argentine having made the morning headlines in a tabloid newspaper as he vented his frustration about failing to win a regular place in the starting line-up.
KAPOLEI, Hawaii (AP) Defending champion Ai Miyazato had five birdies in a late six-hole stretch Thursday at breezy Ko Olina to open a two-stroke lead midway through the second round of the LPGA Lotte Championship.
Kaymer increased his five-stroke overnight lead into an eight-shot advantage after only five holes of the final round.
But he gave himself a nervous finish when he found the lake on the 15th to lead by a single stroke.
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Poulter had seen a five-stroke halfway lead wiped out in just six holes of his third round on Saturday after paying the price for an aggressive approach before a thunderstorm halted play.
It is known that stiffening of the arteries can lead to heart disease and stroke.
Contepomi added the extras to give Leinster a healthy 9-17 lead, but on the stroke of half-time Connor sent over a drop-goal to reduce the deficit to five.
Schalke, ninth in the Bundesliga, never looked like they would throw their huge lead away and on the stroke of half time former Real Madrid striker Raul picked up Jurado's through-ball and rounded Cesar before notching a record 71st Champions League goal.
Jason Day had the second-round lead, Marc Leishman was a stroke back, and Adam Scott was three shots behind.
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