Gamma-Linolenic acid levels correlate with clinical efficacy of evening primrose oil in patients with atopic dermatitis - Simon, D; Eng, P; Borelli, S; Kägi, R; Zahner, C; Moll, C; Ferrari, G; Lautenschlager, S; Wütherich, B; Schmid-Grendelmeier, P (Planta Medica, 2014)