http://europepmc.org/abstract/MED/28481359
http://europepmc.org/abstract/MED/18948947
http://europepmc.org/abstract/MED/25971939
http://europepmc.org/abstract/MED/25567908
http://europepmc.org/abstract/MED/22980975
http://europepmc.org/abstract/MED/29858019