http://europepmc.org/abstract/MED/25487075
http://europepmc.org/abstract/MED/22323480
http://europepmc.org/abstract/MED/23926297
http://europepmc.org/abstract/MED/27884971
http://europepmc.org/abstract/MED/26508027
http://europepmc.org/abstract/MED/27029036
http://europepmc.org/abstract/MED/22902051
http://europepmc.org/abstract/MED/25541999
http://europepmc.org/abstract/MED/25964599
http://europepmc.org/abstract/MED/23832012
http://europepmc.org/abstract/MED/22389253
http://europepmc.org/abstract/MED/22343920
http://europepmc.org/abstract/MED/22932795
http://europepmc.org/abstract/MED/24030381
http://europepmc.org/abstract/MED/24850867
http://europepmc.org/abstract/MED/25305095
http://europepmc.org/abstract/MED/21909114
http://europepmc.org/abstract/MED/22915641