1. Medical University of Lodz, Department of Hypertension, Zeromskiego 113, Lodz 90-549, Poland
2. University College London Medical School, University College London, Department of Clinical Biochemistry, Royal Free Campus, London, UK
3. King's College London School of Medicine, Department of Child Health, London, UK
4. New York Medical College, Cardiology Division, Valhalla, NY, USA
5. Medical University of Lodz, Department of Nephrology, Hypertension and Family Medicine, Lodz, Poland
6. Department of Hypertension, WAM University Hospital in Lodz, Medical University of Lodz, Zeromskiego 113, Lodz 90-549, Poland ; ;