[1] Katholieke Univ Leuven, Dept Publ Hlth & Primary Care, Acad Ctr Nursing & Midwifery, Kapucijnenvoer 35,Box 7001, B-3000 Leuven, Belgium
[2] Univ Hosp Leuven, Dept Nephrol & Renal Transplantat, Herestr 49, B-3000 Leuven, Belgium
[3] Katholieke Univ Leuven, Lab Nephrol, Dept Microbiol & Immunol, Minderbroederstr 10,Box 1030, B-3000 Leuven, Belgium
[4] Imeldaziekenhuis, Nephrol, Imeldalaan 9, B-2820 Bonheiden, Belgium
[5] Sint Trudo Ziekenhuis, Nephrol, Diestersteenweg 100, B-3800 St Truiden, Belgium
[6] Katholieke Univ Leuven, Dept Publ Hlth & Primary Care, Acad Ctr Gen Practice, Kapucijnenvoer 33,Box 7001, B-3000 Leuven, Belgium