Bustos, K.A.S., Cabailo, M.C.B., Cabaneros, A.J.E., Cagampan, J.A.M.R. and MAN, E.N.J. 2019. Effectiveness of deep breathing clock in reducing the anxiety of school- aged children before vaccination. Journal of health and health management. 5, 1 (Jun. 2019), 74–81.