Study protocol for PREPARE: a phase II feasibility/safety randomised controlled trial on PeRiopErative Penicillin AlleRgy TEsting oleh Andrew Stewardson, Allen C Cheng, Jason Trubiano, Sara Vogrin, Trisha Peel, Douglas Johnson, Jo Douglass, Fiona James, Luke Fletcher, Kyra Chua, Joseph F De Luca, Justin Nazareth, Ranjan Guha, Andrew Hardidge, Ned Douglas, John Carruthers