Heterogeneity in direct oral penicillin challenge protocols in penicillin allergy de-labelling - Rashmeet Bhogal; Abid Hussain; Louise Savic; Siraj A. Misbah; Ariyur Balaji; Chidanand Hullur; John F. Marriott; Mamidipudi T. Krishna (Infection Prevention in Practice, 2022)