1. Grace Department of Research, British American Hospital, Lima, Peru.
2. Associate Director of Research, British American Hospital; Asst. Professor of Pediatrics, San Marcos University School of Medicine, Lima, Peru.
3. Chief of Biochentistry Lqboratory, Department of Research, British Anierican Hospital, Linma, Peru.
4. British American Hospital, Linza, Peru; Associate Chief Pediatrician, Baltimore City Hospitals; Associate Professor of Pediatrics, Johns Hopkins University School of Medicine, Baltimore, Md.