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http://europepmc.org/abstract/MED/24563076
http://europepmc.org/abstract/MED/10998080
http://europepmc.org/abstract/MED/10738270
http://europepmc.org/abstract/MED/24185509
http://europepmc.org/abstract/MED/29360550
http://europepmc.org/abstract/MED/22561520