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The author of the book (Francisco Martin) is a researcher on the medicinal use of sea water.
He is neither therapist or doctor. He will answer your questions with the best of his love and knowledge but in any case you should consider his answers as a medical advice. He can only give your general advices, general information. The people whose work is to adapt general information to each (your) specific case are doctors and therapists.
After writing him be sure of the answer, and check for it in the spam folder of your mail, or even the wastebasket.