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)
The six organs in the Palace of Mafra organs were produced that year. Shortly after their completion, the French invasion and the following exile of the Portuguese Court to Brazil led to the organs decaying for lack of maintenance. A decade later – possibly in connection with the prospect of the return of the Portuguese royal family – the six organs were subject to a major intervention. The intent of these works, undertaken by Machado e Cerveira, was not only to repair the instruments but also to enlarge them. Unfortunately, the works were interrupted a few years later (Machado e Cerveira died in 1828), and several items, such