From a traditional medicinal plant to a rational drug: understanding the clinically proven wound healing efficacy of birch bark extract - Ebeling, S; Naumann, K; Pollok, S; Wardecki, T; Vidal-Y-Sy, S; Nascimento, J M; Boerries, M; Schmidt, G; Brandner, J M; Merfort, I (PLoS One, 2014)