http://europepmc.org/abstract/MED/28153863
http://europepmc.org/abstract/MED/28481359
http://europepmc.org/abstract/MED/27135926
http://europepmc.org/abstract/MED/25927147
http://europepmc.org/abstract/MED/29214215
http://europepmc.org/abstract/MED/25320628