Excess Out-of-Hospital Mortality and Declining Oxygen Saturation: The Sentinel Role of Emergency Medical Services Data in the COVID-19 Crisis in Tijuana, Mexico.

"Funding and support: By Annals policy, all authors are required to disclose any and all commercial, financial, and other relationships in any way related to the subject of this article as per ICMJE conflict of interest guidelines (see www.icmje.org). The authors have stated that no such relationships exist. This study was primarily self-funded by the Mexican Red Cross in Tijuana. Mr. Friedman received support from the UCLA Medical Scientist Training program (10.13039/100000002National Institutes of Health National Institute of General Medical Science training grant GM008042)."

"Funding and support: By Annals policy, all authors are required to disclose any and all commercial, financial, and other relationships in any way related to the subject of this article as per ICMJE conflict of interest guidelines (see www.icmje.org ). The authors have stated that no such relationships exist. This study was primarily self-funded by the Mexican Red Cross in Tijuana. Mr. Friedman received support from the UCLA Medical Scientist Training program ( 10.13039/100000002National Institutes of Health National Institute of General Medical Science training grant GM008042)."