The sweet spot study-Developing e-liquid product standards for nicotine form and concentration to improve public health: Protocol for a randomized, double-blinded, crossover study. by Yoo Jin Cho, Marielle C Brinkman, Alice Hinton, Jean D Nshimiyimana, Toral Mehta, Ayomipo Adeniji, Kaila Norton, Ahmad El Hellani, Theodore L Wagener

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