http://europepmc.org/abstract/MED/27288520
http://europepmc.org/abstract/MED/23733339
http://europepmc.org/abstract/MED/27276561
http://europepmc.org/abstract/MED/27458708
http://europepmc.org/abstract/MED/22235851
http://europepmc.org/abstract/MED/24056718
http://europepmc.org/abstract/MED/24522528
http://europepmc.org/abstract/MED/23613835
http://europepmc.org/abstract/MED/25022553