[1] Roberto del Rio Hosp, Dept Pediat Plast & Reconstruct Surg, Santiago, Chile
[2] Van Buren Hosp, Dept Pediat Plast & Reconstruct Surg, Valparaiso, Chile
[3] Univ Chile, Santiago, Chile
[4] Univ Chile, Salvador Hosp, Dept Plast & Reconstruct Surg, Santiago, Chile
[5] Univ Valparaiso, Chair Pediat Surg, Valparaiso, Chile
[6] Univ Valparaiso, Biomed Res Ctr, Valparaiso, Chile
[7] Prof Zanartu 1085, Santiago 8380418, Chile