Celis Becerra F, Zapata Bravo M, Caballero Alvarado JA. Ecological study designs in health research. Rev. Cuerpo Med. HNAAA [Internet]. 2023 Nov. 27 [cited 2024 May 20];16(1). Available from: http://www.cmhnaaa.org.pe/ojs/index.php/rcmhnaaa/article/view/1959