@inbook{1146853722, author={Manoj K. Karmakar and Edmund Soh and Victor Chee and Kenneth Sheah}, title={Preface}, booktitle={Atlas of Sonoanatomy for Regional Anesthesia and Pain Medicine}, publisher={McGraw-Hill Education}, address={New York, NY}, year={2018}, url={accessanesthesiology.mhmedical.com/content.aspx?aid=1146853722} }