Randomized trial comparing cyropreserved cultured epidermal allografts with hydrocolloid dressings in healing chronic venous ulcers. - Teepe,R.; Roseeuw,D.; Hermans,J.; Koebrugge,E.; Altena,T.; Coninck,A.; Ponec,M.; Vermeer,B. (J Am Acad Dermatol, 1993)