Simpson, RC; Murphy, R; Bratton, DJ; Sydes, MR; Wilkes, S; Nankervis, H; Dowey, S; (2016) Systemic therapy for vulval Erosive Lichen Planus (the 'hELP' trial): study protocol for a randomised controlled trial. Trials , 17 (1) , Article 2. 10.1186/s13063-015-1133-z. Green open access