Leungtongkum, P., Piniwatsoontorn, S., Somnasang, P., Kanato, M., Ratanasiri, A., Maskasame, S., Sinsupan, N. and Jitjareuntum, M. 2013. Study groups of mother or relatives whose level of education are higher Than Prathom 4 which normally look after children better than the Similar Groups who have Prathom 4 education or lower; and study different factors which influence the growth of pres. Srinagarind Medical Journal. 2, 1 (Nov. 2013), 23–30.