http://europepmc.org/abstract/MED/25957691
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http://europepmc.org/abstract/MED/22895193
http://europepmc.org/abstract/MED/24525744
http://europepmc.org/abstract/MED/27022117
http://europepmc.org/abstract/MED/25344691
http://europepmc.org/abstract/MED/22810696