Pitisuttithum, Onsiri, Peerasak Chantaraprateep, and Karl Jakob Neeser. 2018. “Prevalence of healthy aging and factors associated in Thai urban elderly, Bangkok, Thailand”. Journal of Health Research 32 (Suppl.2):S167-S176. https://he01.tci-thaijo.org/index.php/jhealthres/article/view/168449.