1. Department of Mathematics Missouri State University Springfield MO USA
2. Charité, – Universitätsmedizin Berlin Corporate Member of Freie Universität Berlin Humboldt‐Universität zu Berlin, and Berlin Institute of Health, Institute of Biometry and Clinical Epidemiology Berlin Germany
3. Berlin Institute of Health (BIH) Berlin Germany
4. Dr. Bing Zhang Department of Statistics University of Kentucky Lexington KY USA