1 1 Department of Statistics, University of Haifa, Haifa, Israel.
2 2 The Biostatistics & BIomathematics Unit, The Gertner Institute for Epidemiology and Health Policy Research, Chaim Sheba Medical Center, Tel HaShomer, Israel.
3 3 School of Public Health, the Sackler Faculty of Medicine, Tel-Aviv University, Tel Aviv, Israel.