Understanding Public Perceptions and Discussions on Opioids Through Twitter: Cross-Sectional Infodemiology Study - Federico Carabot; Oscar Fraile-Martínez; Carolina Donat-Vargas; Javier Santoma; Cielo Garcia-Montero; Mariana Pinto da Costa; Rosa M Molina-Ruiz; Miguel A Ortega; Melchor Alvarez-Mon; Miguel Angel Alvarez-Mon (Journal of Medical Internet Research, 2023)