http://europepmc.org/abstract/MED/24476767
http://europepmc.org/abstract/MED/24531734
http://europepmc.org/abstract/MED/24030381
http://europepmc.org/abstract/MED/24608733
http://europepmc.org/abstract/MED/24325356
http://europepmc.org/abstract/MED/24476766