Cost-Effective Foam-Based Colorimetric Sensor for Roadside Testing of Alcohol in Undiluted Saliva by Krittapas Kaewnu, Kiattisak Promsuwan, Apichai Phonchai, Adul Thiangchanya, Dongsayam Somapa, Namchoke Somapa, Kunanunt Tayayuth, Warakorn Limbut

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