ID guidelines antimicrobials antimicrobial stewardship Implementing an ASP (IDSA/SHEA 2016) Core Elements of Hospital ASP (CDC 2014) Core Elements of Outpatient ASP (CDC 2016) Core Elements of ASP for Nursing Homes (CDC 2015) penicillin allergy Evaluation and Management of Penicillin Allergy (AAAAI, IDSA, SHEA 2019) opat Outpatient Antimicrobial Parenteral Therapy (IDSA 2018)