http://europepmc.org/abstract/MED/28481359
http://europepmc.org/abstract/MED/11309300
http://europepmc.org/abstract/MED/24739824
http://europepmc.org/abstract/MED/11196159
http://europepmc.org/abstract/MED/29360550
http://europepmc.org/abstract/MED/22180306