The educational materials presented here are the individual authors' opinions and not medical advice, are not intended to set out a legal standard of care, and do not replace medical care or the judgment of the responsible medical professional in light of all the circumstances presented by an individual patient. The materials are not intended to ensure a successful patient outcome in every situation and are not a guarantee of any specific outcome. Materials are subject to periodic revision as additional data becomes available. Opinions, beliefs, and viewpoints expressed by the authors do not necessarily reflect the opinions, beliefs, and viewpoints of SOAP or any of its members, employees, or agents.