TY - JOUR AU - Burns, P B; Rohrich, R J; Chung, K C TI - The levels of evidence and their role in evidence-based medicine JO - Plast Reconstr Surg IS - 01 VL - 128 PY - 2011 DO - 10.1097/PRS.0b013e318219c171 L3 - PubMed-ID: 21701348 SP - 305 EP - 310 ER -