I would like to express my sincere gratitude to my colleagues:

            The late Professor Marcel Blanchaer, Professor Emeritus of Biochemistry and Molecular Biology, University of Manitoba, Canada, for kindly giving me his permission to use his scenario of the virtual patient "Charley" and granting permission to me to prepare the Web-version of this case in English and Bulgarian.
             Professor Ekaterina Titianova, PhD, DSc, Head of the Clinic "Functional Diagnostics of the Nervous System" at the Military Medical Academy of Sofia and professor at the Medical Faculty of the Sofia University "St. Kliment Ohridski" and Academician in the Bulgarian Academy of Sciences and Arts, for the video film and the photo of a patient with Parkinson's disease for the scenario of the virtual patient "Dimiter".
             Professor Ivaylo Turnev, PhD, DSc, Department of Neurology, Medical Faculty, Medical University of Sofia, Head of the Neurological Clinic at the "Alexandrovska" Hospital and Professor of Cognitive Science and Psychology at the New Bulgarian University for stimulating discussions improving the scenario of the virtual patient "Dimiter".
            Associate Professor Maya Konstantinova, PhD, Department of Pediatrics, Medical University of Sofia, for kindly giving me her permission to use clinical data for the case with diabetes mellitus type 1 "Rossitsa" and for the stimulating discussions.
            Chief Assistant Professor Bilyana Georgieva, PhD, Department of Medical Chemistry and Biochemistry, Medical University of Sofia, who tested thoroughly the English versions of the virtual patients.
            Ms Maria Dulgerova, Master in Chemistry, for the precise computer illustrations included in the clinical cases.
            Ms Radostina Russeva, Master in English Philology, for the accurate translation of a large volume of data, stimulating discussions and testing of the cases with virtual patients.