Song WJ, Lee SM, Kim MH, Kim SH, Kim KW, Cho SH, Min KU, Chang YS. Histamine and allergen skin reactivity in the elderly population: results from the Korean Longitudinal Study on Health and Aging. Ann Allergy Asthma Immunol. 2011 Oct;107(4):344–52. doi: 10.1016/j.anai.2011.07.012. PMID: 21962095.