http://europepmc.org/abstract/MED/27359055
http://europepmc.org/abstract/MED/23753029
http://europepmc.org/abstract/MED/24402164
http://europepmc.org/abstract/MED/23648668
http://europepmc.org/abstract/MED/22929312
http://europepmc.org/abstract/MED/27458708
http://europepmc.org/abstract/MED/23018865
http://europepmc.org/abstract/MED/25022553