Hi thank you for mentioning the Cockcroft - Gault equation which we used for many years. Please can you tell me why it was replaced? Perhaps it was just that our technical know-how and digital& tech abilities made it obsolete. In the 1980s I was a year one resident in Atlantic Canada for nephrologist Dr Harry Gault -a fellow Montrealer. He developed the equation in Montreal I believe at the Queen Mary Vets Hospital. Anyway Dr Gault was a really nice man and I found for decades his equation very useful in so much of my work -even abroad in the UK. Dr Harry Gault really led the way for us by having a useful GFR calculation for our time as clinicians. I was sad to hear of his death in the early 2000's and wish there was more remembrance of him in medical & renal circles at home here in Canada. Certainly the Americans & British used his equation ++ & would make a big show of his contribution(s). Thank you so much for your presentation -very much appreciated.