Table:
Study	Number of study subjects	Country	Proportion (%) with more than one melanoma	Median follow-up time (years)
Martínet al. 2014 [17]	741	Spain	2.56	Not known
Tóth et al. 2013 [36]	740	Hungary	6	2
Hwa et al. 2012 [2]	788	USA	7.7	3.7
Vecchiato 2012 [1]	2987	Italy	7.2	4.8
Savoia et al. 2012 [4]	4938	Italy	6.4	Not known
Bower et al. 2010 [5]	2506	USA	1.9	5.5
De Giorgi et al. 2010 [15]	672	Italy	5.95	Not known
Uliasz and Lebwohl 2007 [13]	877	USA	12.7	Not known
Ferrone et al. 2005 [3]	4484	USA	8.6	2.2
Doubrovsky and Menzies 2003 [14]	5250	Australia	5.7	Not known
Burden 1994 [23]	3818	Scotland	1.2	Not known
Slingluff Jr. et al. 1993 [25]	7816	USA	3.6	4.8

Transform the picture into Markdown format.

| Study | Number of study subjects | Country | Proportion (%) with more than one melanoma | Median follow-up time (years) | 
 | --- | --- | --- | --- | --- | 
 | Martínet al. 2014 [17] | 741 | Spain | 2.56 | Not known | 
 | Tóth et al. 2013 [36] | 740 | Hungary | 6 | 2 | 
 | Hwa et al. 2012 [2] | 788 | USA | 7.7 | 3.7 | 
 | Vecchiato 2012 [1] | 2987 | Italy | 7.2 | 4.8 | 
 | Savoia et al. 2012 [4] | 4938 | Italy | 6.4 | Not known | 
 | Bower et al. 2010 [5] | 2506 | USA | 1.9 | 5.5 | 
 | De Giorgi et al. 2010 [15] | 672 | Italy | 5.95 | Not known | 
 | Uliasz and Lebwohl 2007 [13] | 877 | USA | 12.7 | Not known | 
 | Ferrone et al. 2005 [3] | 4484 | USA | 8.6 | 2.2 | 
 | Doubrovsky and Menzies 2003 [14] | 5250 | Australia | 5.7 | Not known | 
 | Burden 1994 [23] | 3818 | Scotland | 1.2 | Not known | 
 | Slingluff Jr. et al. 1993 [25] | 7816 | USA | 3.6 | 4.8 |