Table 5.

Duration of symptoms prior to presentation and diagnosis over the decades

	1940s	1950s	1960s	1970s	1980s	1990s	2000s	2010s	Total
Number of cases	1	17	57	38	15	28	34	67	257
Median duration of symptoms	6 months	60 months	42 months	48 months	60 months	12 months	12 months	9 months	24 months (n=182)