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http://europepmc.org/abstract/MED/24844595
http://europepmc.org/abstract/MED/27159395
http://europepmc.org/abstract/MED/26763250
http://europepmc.org/abstract/MED/28795426
http://europepmc.org/abstract/MED/27006490
http://europepmc.org/abstract/MED/27894751
http://europepmc.org/abstract/MED/25224212