http://europepmc.org/abstract/MED/24478380
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http://europepmc.org/abstract/MED/24563076
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http://europepmc.org/abstract/MED/22824796
http://europepmc.org/abstract/MED/29360550
http://europepmc.org/abstract/MED/22180306
http://europepmc.org/abstract/MED/24550739
http://europepmc.org/abstract/MED/22503487
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