http://europepmc.org/abstract/MED/20678218 http://europepmc.org/abstract/MED/21325596 http://europepmc.org/abstract/MED/24523240 http://europepmc.org/abstract/MED/22237025 http://europepmc.org/abstract/MED/21339757 http://europepmc.org/abstract/MED/24923295 http://europepmc.org/abstract/MED/17485549 http://europepmc.org/abstract/MED/16627249 http://europepmc.org/abstract/MED/12529654 http://europepmc.org/abstract/MED/27288520 http://europepmc.org/abstract/MED/24497565 http://europepmc.org/abstract/MED/11023523 http://europepmc.org/abstract/MED/21294243 http://europepmc.org/abstract/MED/27881874 http://europepmc.org/abstract/MED/25381062 http://europepmc.org/abstract/MED/20693432 http://europepmc.org/abstract/MED/25652455 http://europepmc.org/abstract/MED/27063598 http://europepmc.org/abstract/MED/19773259 http://europepmc.org/abstract/MED/26438511 http://europepmc.org/abstract/MED/22814295 http://europepmc.org/abstract/MED/17377585 http://europepmc.org/abstract/MED/25022553 http://europepmc.org/abstract/MED/12555067 http://europepmc.org/abstract/MED/27359055 http://europepmc.org/abstract/MED/27276561 http://europepmc.org/abstract/MED/21343560 http://europepmc.org/abstract/MED/27458708