Clinical outcome measures and scoring systems used in prospective studies of port wine stains: A systematic review. - van Raath, M. Ingmar; Chohan, Sandeep; Wolkerstorfer, Albert; van der Horst, Chantal M. A. M.; Limpens, Jacqueline; Huang, Xuan; Ding, Baoyue; Storm, Gert; van der Hulst, René R. W. J.; Heger, Michal (PLoS ONE, 2020)