PIER Structure and Format The basic unit of PIER is the module. There are five module types: Disease Screening and Prevention Complementary and Alternative Medicine Ethical and Legal Issues Procedures Modules are designed to allow the user to drill down from more general to specific information, with immediate access to underlying supporting evidence from the medical literature. Next Contents The information in PIER should never be used as a substitute for clinical judgment and does not represent an official position of ACP. PIER is copyrighted (c) 2009 by the American College of Physicians, 190 N. Independence Mall West, Philadelphia, PA 19106-1572, USA.