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 six ranks. Continuing with church organ construction, Johnson built organs of increasing size. His first two-manual organ was Opus 13, 1849, at the Congregational Church in Westfield, Massachusetts. This organ contained about 15 ranks. Further expanding his territory and size, Opus 40, a 34-stop three-manual organ, was built in 1855 for the Park Presbyterian Church in Troy, New York. Another 1855 organ is believed to be the oldest Johnson organ which still exists in its original form. It is Johnson's Opus 43, built at the First Ward Presbyterian Church (later the Westminster Presbyterian Church) in Syracuse, New York. In 1871,