http://europepmc.org/abstract/MED/11801559
http://europepmc.org/abstract/MED/1346255
http://europepmc.org/abstract/MED/26757882
http://europepmc.org/abstract/MED/11221842
http://europepmc.org/abstract/MED/25740784
http://europepmc.org/abstract/MED/23970477
http://europepmc.org/abstract/MED/26191234
http://europepmc.org/abstract/MED/25529192
http://europepmc.org/abstract/MED/16818615
http://europepmc.org/abstract/MED/28218421
http://europepmc.org/abstract/MED/24705251
http://europepmc.org/abstract/MED/24510240
http://europepmc.org/abstract/MED/18772396
http://europepmc.org/abstract/MED/29026176
http://europepmc.org/abstract/MED/23441165
http://europepmc.org/abstract/MED/29683790
http://europepmc.org/abstract/MED/22821383
http://europepmc.org/abstract/MED/22865003
http://europepmc.org/abstract/MED/22286061
http://europepmc.org/abstract/MED/24140581
http://europepmc.org/abstract/MED/28481359
http://europepmc.org/abstract/MED/1347252
http://europepmc.org/abstract/MED/23917401
http://europepmc.org/abstract/MED/23592488