Affiliations Research 1981[position unknown]Universidad Peruana Cayetano Heredia1982[position unknown]Universidad Peruana Cayetano Heredia1985[position unknown]University Of Pennsylvania1986[position unknown]University Of Pennsylvania1987[position unknown]Case Western Reserve University 1981[subject unknown]Other Research Personnel1982[subject unknown]Other Research Personnel1985[subject unknown]Other Research Personnel1986[subject unknown]Other Research Personnel1987[subject unknown]Other Research Personnel