Copley-Merriman C, Stevinson K, Liu FX, Wang J, Mauskopf J, Zimovetz EA, Chmielowski B. Direct costs associated with adverse events of systemic therapies for advanced melanoma: Systematic literature review. Medicine. 2018 Aug;97(31):e11736. doi: 10.1097/MD.0000000000011736
Christensen T, Riis AH, Hatch EE, Wise LA, Nielsen MG, Rothman KJ, Toft Sorensen H, Mikkelsen EM. Costs and efficiency of online and offline recruitment methods: a web-based cohort study. J Med Internet Res. 2017 Mar 1;19(3):e58. doi: 10.2196/jmir.6716