Fig. 2From: Liposomal delivery of gene therapy for ovarian cancer: a systematic reviewNumber of included studies published per year since the year 2000: The years with the most included studies on liposomes and gene therapy for ovarian cancer in the last 20 years were 2013 (n = 7), 2019 (n = 6), 2020 (n = 6), and 2021 (n = 6)Back to article page