Wang L, Hilliges M, Jernberg T, Wiegleb-Edstrom D, Johansson O, “Protein gene product 9.5-immunoreactive nerve fibres and cells in human skin”, Cell Tissue Res 1990; 261: 25-33 Johansson O, Hilliges M, Bjornhagen V, Hall K, “Skin changes in patients claiming to suffer from “screen dermatitis”: a two-case open-field provocation study”, Exp Dermatol 1994; 3: 234-238