Table 1. Causes of Dropout.

Subjects and early dropout causes	No. (%)
Total no. of subjects	1,335 (100)
Subjects who completed the study	639 (47.16)
Subjects who dropped out of the study early	716 (52.84)
Lost to follow-up	289 (40.36)
Adverse event	116 (16.20)
Patient's choice	109 (15.22)
Pain relief or pain resolution	90 (12.57)
Patient's uncooperativeness	22 (3.07)
Consent withdrawal	7 (0.98)
Protocol violation	4 (0.56)
Judgment by investigator	1 (0.14)
Others	78 (10.89)