College of Nursing, Yonsei University, Seoul, Korea.
© 2013 Korean Academy of Community Health Nursing
This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education Science and Technology (No. 2010-006684 & No. 2012R1A1A3019009).
†Percentages do not add up to 100 because of missing data.