Polish Society of Nephrology improvements in continuous professional development as well as research activities among young doctors and other professionals in the fields of nephrology, dialysis therapy and renal transplantation. PSN Congresses are organized every three years. As yet twelve Congresses were held in the following locations in Poland: 1st Congress - Bydgoszcz (1983) 2nd Congress - Kraków (1986) 3rd Congress - Gdańsk (1989) 4th Congress - Katowice (1992) 5th Congress - Lublin (1995) 6th Congress - Poznań (1998) 7th Congress - Kraków (2001) 8th Congress - Białystok (2004) 9th Congress – Katowice/Wisła (2007) 10th Congress - Bydgoszcz (2010) 11th Congress - Wrocław (2013)
Johnson Organs H. Johnson, who had worked in the shop since he was 16, became an official member of the firm. With a new name, "Johnson and Son", the company was back in operation soon enough to produce 52 new organs in Chicago, Illinois, after the 1871 Great Chicago Fire. A new factory was built in 1873, and another in the mid-1880s. Johnson and Son continued the work of the William A. Johnson Organ Company, building an additional 500 organs. Their largest organs were of around 55 ranks. Throughout the years, Johnson organs were well known for their "excellent balance, splendid dignity,