http://europepmc.org/abstract/MED/26206799
http://europepmc.org/abstract/MED/25595890
http://europepmc.org/abstract/MED/8555068
http://europepmc.org/abstract/MED/8641406
http://europepmc.org/abstract/MED/7632963
http://europepmc.org/abstract/MED/7882348
http://europepmc.org/abstract/MED/7632931
http://europepmc.org/abstract/MED/8547074
http://europepmc.org/abstract/MED/8637234
http://europepmc.org/abstract/MED/10090949
http://europepmc.org/abstract/MED/8637233
http://europepmc.org/abstract/MED/8665486
http://europepmc.org/abstract/MED/12870051
http://europepmc.org/abstract/MED/7630199
http://europepmc.org/abstract/MED/7882134
http://europepmc.org/abstract/MED/8630377
http://europepmc.org/abstract/MED/7606004
http://europepmc.org/abstract/MED/28157215
http://europepmc.org/abstract/MED/11380395