Participants
For the study participants, a total of 214 adults were selected from two companies and two universities in Gyeonggi-do and Seoul in South Korea. Seventeen of them, however, failed to complete the questionnaires, and thus, only 197 of them were included in this study. Of these, 64 were male and 133 were female, with ages ranging from 18 to 53 years (M =26.06; SD = 5.96). Each participant provided a written informed consent after receiving a full explanation of the study’s purpose and procedure as approved by the Institutional Review Board of Seoul St. Mary’s Hospital. The study participants’ demographic features are shown in Table 1.