Table 1.

Patient demographic information

Local data
Total number		287
Sex	Male	152
	Female	135
Mean age (range)		76 (18–98)
Side	Left	117
	Right	108
Site	Normal	62
	ICA	60
	M1	116
	M2	49
External data
Total number		44
Sex	Male	21
	Female	23
Mean age (range)		61 (18–94)
Side	Left	23
	Right	21
Site	Normal	11
	ICA	11
	M1	12
	M2	10