Vitamin A and Retinoid Derivatives for Lung Cancer: A Systematic Review and Meta Analysis Fritz, Heidi ; Kennedy, Deborah ; Fergusson, Dean ; Fernandes, Rochelle ; Doucette, Steve ; Cooley, Kieran ; Seely, Andrew ; Sagar, Stephen ; Wong, Raimond ; Seely, Dugald Abstract Publication: PLoS ONE Pub Date: June 2011 DOI: 10.1371/journal.pone.0021107 Bibcode: 2011PLoSO...621107F