PEMCRC anaphylaxis study protocol: a multicentre cohort study to derive and validate clinical decision models for the emergency department management of children with anaphylaxis oleh Rakesh D Mistry, Kenneth A Michelson, Stephanie Boyd, Mark I Neuman, Timothy E Dribin, David Vyles, David C Brousseau, Peter S Dayan, Nanhua Zhang, Shiv Viswanathan, John Witry, David Schnadower