http://europepmc.org/abstract/MED/24816253
http://europepmc.org/abstract/MED/9460999
http://europepmc.org/abstract/MED/11161397
http://europepmc.org/abstract/MED/12172044
http://europepmc.org/abstract/MED/15064998
http://europepmc.org/abstract/MED/17523278
http://europepmc.org/abstract/MED/22484628
http://europepmc.org/abstract/MED/11895856
http://europepmc.org/abstract/MED/25042771
http://europepmc.org/abstract/MED/7606196
http://europepmc.org/abstract/MED/11837710
http://europepmc.org/abstract/MED/11846063
http://europepmc.org/abstract/MED/8940997
http://europepmc.org/abstract/MED/24690483
http://europepmc.org/abstract/MED/9886570
http://europepmc.org/abstract/MED/23196062
http://europepmc.org/abstract/MED/15254976
http://europepmc.org/abstract/MED/11141476
http://europepmc.org/abstract/MED/7633655
http://europepmc.org/abstract/MED/11376803
http://europepmc.org/abstract/MED/25656989