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 as the reassembling of the organ of São Pedro d’Alcântara, were left unfinished. Until 1998, the organs only received minor repairs. That year, the global restoration of the ensemble, entrusted to the Portuguese organ builder Dinarte Machado, began and was concluded in 2010. This project included the reconstruction of the organ of São Pedro d’Alcântara, incorporating all the materials recovered since it was disassembled around 1820. The six organs (two in the main chapel, two in the northern transept, and two in the southern transept), although different, have several common features. Some, like the horizontal reeds and the divided keyboard,