Le-Hao Zhang, Zhen-Zhen Qi, Bin Tian, Zu-Qiang Yin & Shenzhou Lu. (2022). The Effects of Different Density Microneedles on Melatonin Release.
            <i>Journal of Fiber Bioengineering and Informatics</i>. <i>15</i> (2).
            55-66.
         doi:10.3993/jfbim00374