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
Esterberg E, Acharya NR. Corticosteroid-sparing therapy: practice patterns among uveitis specialists. J Ophthalmic Inflamm Infect. 2012 Mar;2(1):21-8. doi: 10.1007/s12348-011-0047-5
Lawson DH, Jick H, Rothman KJ. Coffee and tea consumption and breast disease. Surgery. 1981 Jan 1;90(5):801-3.