ACKNOWLEDGMENTS We wish to thank Dr. Salvador Zubirán, Director of the Hospital de Enfermedades de la Nutrición where this work was carried out, and Dr. Bernardo Sepúlveda for their interest in the realization of this investigation. We are grateful also to the personnel of the Instituto Nacional de Cardiología, who helped us with the drawings and photography. We also thank Miss Isabel Escobar Berea, Q.F.B., and Dr. Edmundo Rojas for their invaluable technical co-operation.

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