There are errors in the author affiliations. The publisher apologizes for the errors.The correct affiliations are as follows: Thu Hoang Thanh 1 , Nhan Nguyen Thi 2 , Toan Nguyen Khac 3 1 University of Economics Ho Chi Minh City–UEH, Ho Chi Minh City, Vietnam, 2 Department of Midwifery, Faculty of Nursing and Medical Technology, University of Medicine and Pharmacy at Ho Chi Minh City, Vietnam, 3 Institute of Intelligent and Interactive Technologies, University of Economics Ho Chi Minh City, Vietnam.