id	keyword
gra-1920	block
gra-1920	group
gra-1920	dexmedetomidine
gra-1920	analgesia
gra-1920	levobupivacaine
gra-1920	ropivacaine
gra-1920	plexus
gra-1920	study
gra-1920	patients
gra-1920	duration
gra-1920	anaesthesia
gra-1920	mean