http://europepmc.org/abstract/MED/25393798
http://europepmc.org/abstract/MED/23661334
http://europepmc.org/abstract/MED/21030459
http://europepmc.org/abstract/MED/23609245
http://europepmc.org/abstract/MED/22323876
http://europepmc.org/abstract/MED/24346091
http://europepmc.org/abstract/MED/20624322
http://europepmc.org/abstract/MED/22768234
http://europepmc.org/abstract/MED/20926401
http://europepmc.org/abstract/MED/24810493
http://europepmc.org/abstract/MED/18594010
http://europepmc.org/abstract/MED/20183914
http://europepmc.org/abstract/MED/23344087
http://europepmc.org/abstract/MED/22964709
http://europepmc.org/abstract/MED/23198868
http://europepmc.org/abstract/MED/17625570
http://europepmc.org/abstract/MED/24123310
http://europepmc.org/abstract/MED/23951022
http://europepmc.org/abstract/MED/23372947
http://europepmc.org/abstract/MED/22736493
http://europepmc.org/abstract/MED/27130468
http://europepmc.org/abstract/MED/22129856
http://europepmc.org/abstract/MED/20813423
http://europepmc.org/abstract/MED/24982409
http://europepmc.org/abstract/MED/18320074
http://europepmc.org/abstract/MED/24443522
http://europepmc.org/abstract/MED/25393796
http://europepmc.org/abstract/MED/24183104
http://europepmc.org/abstract/MED/19667264
http://europepmc.org/abstract/MED/19170230
http://europepmc.org/abstract/MED/21642865
http://europepmc.org/abstract/MED/19472407
http://europepmc.org/abstract/MED/23341890
http://europepmc.org/abstract/MED/18083107
http://europepmc.org/abstract/MED/23277484
http://europepmc.org/abstract/MED/26464158