http://europepmc.org/abstract/MED/12417040
http://europepmc.org/abstract/MED/28481359
http://europepmc.org/abstract/MED/28088512
http://europepmc.org/abstract/MED/11280771
http://europepmc.org/abstract/MED/8589032
http://europepmc.org/abstract/MED/27528220