Key points are not available for this paper at this time.
1Departments of Medicine, Renal Medicine and Obstetrics, St George Hospital, University of NSW, Australia. 2Correspondence to Associate Professor M.A. Brown, Department of Renal Medicine, St George Hospital, Kogarah, Sydney 2217, NSW, Australia. Received 14 May 1997
Brown et al. (Wed,) studied this question.