http://europepmc.org/abstract/MED/26563128
http://europepmc.org/abstract/MED/30181556
http://europepmc.org/abstract/MED/24185512
http://europepmc.org/abstract/MED/28580595
http://europepmc.org/abstract/MED/28270497
http://europepmc.org/abstract/MED/28283903
http://europepmc.org/abstract/MED/27551012
http://europepmc.org/abstract/MED/24398047
http://europepmc.org/abstract/MED/24185510