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Siefried, Krista J., Bascombe, Florence, Acheson, Liam, Moller, Carl, Bath, Nicky, Ezard, Nadine, Clifford, Brendan, Liu, Zhixin, Middleton, Peter, Kay-Lambkin, Frances, Freestone, Jack, Herman, Daniel, Millard, Michael, Steele, Maureen. JMIR Publications, Inc.; 2024. Effect of a Smartphone App (S-Check) on Actual and Intended Help-Seeking and Motivation to Change Methamphetamine Use Among Adult Consumers of Methamphetamine in Australia: Randomized Waitlist-Controlled Trial.