http://europepmc.org/abstract/MED/11438467
http://europepmc.org/abstract/MED/9515810
http://europepmc.org/abstract/MED/11522621
http://europepmc.org/abstract/MED/7632961
http://europepmc.org/abstract/MED/26647218
http://europepmc.org/abstract/MED/10520030
http://europepmc.org/abstract/MED/8698617
http://europepmc.org/abstract/MED/11021747