Motivational telephone intervention to risk gamblers by a state-owned gambling operator in Sweden.

"Conflict of interest KF, MD, and AL are employed by the state-owned gambling operator of Sweden, AB Svenska Spel, and are involved with the responsible gambling work of that operator. AH has research funding from AB Svenska Spel as well as from its research council. The author(s) declared that they were an editorial board member of Frontiers, at the time of submission. This had no impact on the peer review process and the final decision."

"The author(s) declare financial support was received for the research, authorship, and/or publication of this article. This research was made possible thanks to the overall research funding of the first author from the state-owned gambling operator AB Svenska Spel and from the Health-care Services of Region Skåne, Sweden."

"All data were derived from the client registers of AB Svenska Spel, and delivered to the first author in a fully de-identified format. The study was approved by the Swedish Ethics Authority (file number 2020/03281), and it was pre-registered on clinicaltrials.gov with the clinical trials identifier number NCT04646421 (registered 30/11/2020)."