Measurement of soft tissue drug concentrations in morbidly obese and non-obese patients – a prospective, parallel group, open-labeled, controlled, phase IV, single center clinical trial - Simon, P; Petroff, D; Dorn, C; Ehmann, L; Kloft, C; Prettin, C; Dietrich, A; Zeitlinger, M; Kees, F; Wrigge, H (Contemp Clin Trials Commun, 2019)