A US Retrospective Claims Analysis Comparing Healthcare Costs of Patients Transitioning from Immediate-Release Oxycodone to Two Different Formulations of Extended-Release Oxycodone: Xtampza ER or OxyContin. - Olatoke O; Zah V; Stanicic F; Vukicevic D; Yfantopoulos P; Thompson C; DeGeorge MK; Passik S (ClinicoEconomics and outcomes research : CEOR, 2022)