Table 2
PPC: classification of articles by design or main focus (N = 27)
| Kind of study | N | Reference |
|---|---|---|
| Comments/reflections | 13 | Calhoun 1997 [12], Hoeldtke 2001 [13], Milstein 2005 [14], Bhatia 2006 [15], Buus-Frank 2006 [16], Pearce 2006 [17], Sumner 2006 [18], Munson 2007 [19], Pignotti 2007 [20], Roy 2007 [21], Williams 2008 [22], Bétrémieux 2009 [23], Payot 2009 [24] |
| Clinical studies | 8 | |
 Case reports | 3 | Watkins 1989 [25], Flower 1992 [26], Nuutila 2008 [27] |
| Quantitative (series) | 4 | Calhoun 2003 [1], D'Almeida 2006 [28], Breeze 2007 [29], Leuthner 2007 [30] |
| Qualitative (series) | 1 | Chitty 1996 [31] |
| Guidelines/clinical practice proposals | 5 | Craig 2003 [32], Leuthner 2004 [33], Leuthner 2004 (b) [34], Ramer-Chrastek 2005 [35], Howard 2006 [36] |
| Designing/describing a PC programme | 1 | Catlin 2002 [37] |