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In the References and Reviews section of the July 11 issue (197:Adv 225) the last two words of this abstract should read "osmotic gradient."
Peritoneal Ultrafiltration Dialysis [J Clin Invest 45:950 (June) 1966]. JAMA. 1966;197(13):243. doi:10.1001/jama.1966.03110130161095