Table 2.

Reported adverse events

Patients	Benign		Moderate		Severe		Severe/
	Back	Leg	Back	Leg	Back	Leg	irreversible
1					+	+
2	+		+
3			+	+
4	+
5			+
6		+
7					+	+
8	+	+
Frequency	3	2	3	1	2	2	0