http://europepmc.org/abstract/MED/22591444
http://europepmc.org/abstract/MED/23764841
http://europepmc.org/abstract/MED/28915660
http://europepmc.org/abstract/MED/28481359
http://europepmc.org/abstract/MED/19228619
http://europepmc.org/abstract/MED/22072542
http://europepmc.org/abstract/MED/20131059
http://europepmc.org/abstract/MED/21913188
http://europepmc.org/abstract/MED/28042970
http://europepmc.org/abstract/MED/25427834
http://europepmc.org/abstract/MED/29683790
http://europepmc.org/abstract/MED/19554337
http://europepmc.org/abstract/MED/25257301
http://europepmc.org/abstract/MED/24149775
http://europepmc.org/abstract/MED/22426639