“…1 Several studies have been conducted to assess the production of research work in PC, for example in Germany, Australia, and Egypt. [2][3][4] Two studies have been performed internationally, the first conerning the development of research in PC from 1975 to 2003 in 4 Nordic countries, 7 European countries, and 7 other countries 5 and the second concerning the development of research in PC from 2001 to 2007 in 6 countries (Australia, Canada, Germany, the Netherlands, the UK and the US). 6 Our intention was to update and expand information regarding the field of research in PC.…”