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Nueva visita / Visita posterior / Visita adicional / Segunda visita ... al médico
Explanation: Agrego información del ENCARTA WORLD ENGLISH DICTIONARY:
1. continuation: further action or investigation or a subsequent event that results from and is intended to supplement something done before The conference was intended as a follow-up to the summit meeting in Vienna.
2. something giving more information: a book, film, article, or report that continues a story or provides further information
Encarta World English Dictionary.