I would like to express my thanks to the head of the Pharmacobiochemical Laboratory of 3rd Medical Department and the head of 3rd Medical Department Medical Faculty, Comenius University in Bratislava, Associated Professor Viliam Mojto, MD, CSc., MPH, MHA for support and space for creative work. I would like to thank my long-term colleagues and co-authors of this monography for their cooperation: PharmDr. Jarmila Kucharská, CSc., who introduced at our workplace a method for the determination of antioxidants, including coenzyme Q10 in patients in the blood, plasma, tissues, platelets; to RNDr. Zuzana Sumbalová, PhD., who introduced a new non-invasive method of determining respiration and mitochondrial bioenergetics in isolated platelets and tissues in patients at our workplace.

My thanks go to Dr. Raj K. Chopra, President of Tishcon Corp. USA, for long-term cooperation and provision of various types of coenzyme Q10 for clinical and experimental studies, to KANEKA Corp., Japan (Dr. Peter Lambrechts, Dr. Kazunori Hosoe, Dr. Iwao Funahashi and Dr. Hyashi Yahara) for collaborating and providing reduced coenzyme Q10 (ubiquinol) on clinical study.
My thanks go to the Medical Faculty of Comenius University in Bratislava for approving this university textbook.
Thank you to the reviewers, Professor Katarína Gazdíková, MD, PhD, MPH and Professor Marián Bernadič, MD, PhD, Editor-in-chief, for the evaluation of the submitted manuscript, as well as for the proof reading of PhDr. Helena Bernadičová.
I am also grateful to my son, Ing. arch. Peter Gvozdjak, with whom we spent many hours creating color metabolic images focused on mitochondria and coenzyme Q10, as well as for the design of the cover of this monograph.
My thanks go to the HERBA Publishing House, especially to the director Mgr. Milan Lehký for the care he devoted to publishing the textbook, to the technical editor Mgr. Š. Olexym for advice and assistance in preparing a monograph.

Anna Gvozdjakova