 Dr Hertoghe has written 7 books including the Hormone Manual, one of the leading text books for physicians practising abroad in this field.Hind said Thierry Hertoghe was highly respected, had written a number of books and addressed international conferences.Mary took her daughter to Brussels where Dr Hertoghe carried out tests on 40 hormones and minerals, far more than carried out by the NHS and diagnosed chronic fatigue syndrome caused by hormone deficiencies.