Donating blood on a regular basis reduces blood pressure (in hypertensives): appearances are not deceiving. Issue 4 (4th April 2019) - Kamhieh‐Milz, Julian; Tauchmann, Yvonne; Kamhieh‐Milz, Sundrela; Pruss, Axel; Doerffel, Yvonne; Michalsen, Andreas