About the Authors

Min Kwon

Affiliation Addiction Research Institute, Department of Psychiatry, Seoul St. Mary's Hospital, The Catholic University of Korea, Seoul, South Korea

Dai-Jin Kim

Affiliation Department of Psychiatry, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, South Korea

Hyun Cho

Affiliation Addiction Research Institute, Department of Psychiatry, Seoul St. Mary's Hospital, The Catholic University of Korea, Seoul, South Korea

Soo Yang

sooy@catholic.ac.kr

Affiliation College of Nursing, The Catholic University of Korea, Seoul, South Korea

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: MK DJK HC SY. Performed the experiments: MK HC. Analyzed the data: MK HC. Contributed reagents/materials/analysis tools: MK DJK HC SY. Wrote the paper: MK.