Table 1 Research survey distribution of web survey and gang survey methods

Area	City/province1	2017	2018
Metropolitan	Seoul / Incheon / Gyeonggi	261	798
Chungcheong	Daejeon / Sejong / CB / CN	48	159
Honam	Gwangju / Jeonbuk / Jeonnam	47	136
Yeongnam	Busan / Daegu / Ulsan / GB / GN	125	375
Gangwon & Jeju	Gangwon / Jeju	20	62
Total		502	1,530

¹ CB, Chungbuk; CN, Chungnam; GB, Gyeongbuk; GN, Gyeongnam.