http://europepmc.org/abstract/MED/24218139
http://europepmc.org/abstract/MED/23926297
http://europepmc.org/abstract/MED/24127063
http://europepmc.org/abstract/MED/24850867
http://europepmc.org/abstract/MED/24030381
http://europepmc.org/abstract/MED/20601954
http://europepmc.org/abstract/MED/23443343