Table 2.

The themes covered in the coding of the included papers

Themes covered	Reviews	Questionnaires/surveys	In-depth interviews	Miscellaneous
Attitudes of parents	Tooher 2008 [30]	Burgess 2003 [25]	Baker 2005 [24]	Hoehn 2005 [17]
		Hayman 2001 [16]	Brinchmann 2002 [36]
		Maayan-Metzger 2008 [19]	Hoehn 2009 [32]
		Morley 2005 [20]	Hulst 2005 [31]
		Paulmichl 2011 [43]	Jollye 2009 [18]
		Singhal 2002 [26]	Kavanaugh 2005 [37]
		Smyth 2009 [22]	Kenyon 2004 [50]
		Stenson 2004 [35]	Korotchikova 2010 [29],
		Zupancic 1997 [21]	Mason 2000 [34]
			McHaffie 2001 [38]
			Smyth 2012 [23]
			Snowdon 1998 [33]
			Snowdon 2004 [39]
			Snowdon 2006 [28]
			Ward 2009 [27]
Attitudes of clinicians		Paulmichl 2011 [43]	Albersheim 2010 [40]
		Singhal 2004 [41]	De Leeuw 2000 [61]
			Garel 2004 [62]
			Garel 2011 [44]
			McHaffie 2001 [38]
			Snowdon 2004 [42]
Validity of consent	Tooher 2008 [30]	Ballard 2004 [46]	Allmark 2006 [47]
		Ballard 2011 [51]	Hoehn 2005 [17]
		Burgess 2003 [25]	Hoehn 2009 [32]
		Daniels 2006 [52]	Jollye 2009 [18]
		East 2006 [49]	Kenyon 2004 [50]
		Hayman 2001 [16]	Mason 2000 [34]
		Kenyon 2004 [50]	Smyth 2012 [23]
		Marc-Aurele 2012 [45]	Snowdon 1997 [48]
		Nathan 2010 [59]	Snowdon 2006 [28]
		Smyth 2009 [22]	Ward 2009 [27]
		Stenson 2004 [35]
Different consent processes	Hundley 2004 [56]	Ballard 2004 [46]	Allmark 2006 [47]
		Ballard 2011 [51]	Hoehn 2009 [32]
		Culbert 2005 [53]	Mohanna 1999 [58]
		East 2006 [49]	Rogers 1998 [55]
		Woodward 2012 [54]	Smyth 2012 [23]
Miscellaneous topics			Rogers 1998 [55]	Schmidt 1999 [57]
			Saigal 1999 [63]	Sharma 2011 [64]
			Simon 2006 [60]
			Snowdon 1998 [33]