id	keyword
hls-11769	learning
hls-11769	health
hls-11769	covid-19
hls-11769	dental
hls-11769	group
hls-11769	online
hls-11769	knowledge
hls-11769	students
hls-11769	promotion
hls-11769	control
hls-11769	videos
hls-11769	media