TY - RPRT TI - Collagen sponge for leg ulcers. AU - J L Burton AU - D J Etherington AU - R D Peachey PY - 1978 DO - 10.1111/j.1365-2133.1978.tb07063.x UR - https://pubmed.ncbi.nlm.nih.gov/737130/ ID - 737130 ER -