id	keyword
dpc-5172	tretinoin
dpc-5172	skin
dpc-5172	treatment
dpc-5172	wrinkles
dpc-5172	trials
dpc-5172	dermatol
dpc-5172	pmid
dpc-5172	photoaging
dpc-5172	study
dpc-5172	review
dpc-5172	coarse
dpc-5172	improvement
dpc-5172	data
dpc-5172	analysis
dpc-5172	photodamage
dpc-5172	studies