---- Acknowledgments ----
We thank Pascaline Dupas and the J-PAL Board and Reviewers who provided important feedback that improved the design and implementation of the experiment. We thank Ran Abramitzky, Ned Augenblick, Jeremy Bulow, Kate Casey, Arun Chandrasekhar, Raj Chetty, Stefano DellaVigna, Mark Duggan, Karen Eggleston, Erica Field, Matthew Gentzkow, Gopi Shah Goda, Susan Godlonton, Jessica Goldberg, Michael Greenstone, Guido Imbens, Seema Jayachandran, Damon Jones, Supreet Kaur, Melanie Morten, Maria Polyakova, Matthew Rabin, Al Roth, Kosali Simon, EbonyaWashington, Crystal Yang and seminar participants at Berkeley Economics and Stanford Health Policy for their helpful comments. Javarcia Ivory, Matin Mirramezani, Edna Idna, Anlu Xing and especially Morgan Foy provided excellent research assistance. We thank the study doctors and field staff team for their participation and dedication. We thank the administration at Stanford, SIEPR, and J-PAL particularly Lesley Chang, Rhonda McClinton-Brown, Dr. Mark Cullen, Dr. Douglas K. Owens, Ann Dohn, Ashima Goel, Atty. Ann James, Atty. Tina Dobleman, Nancy Lonhart, Jason Bauman, Sophie Shank, James Turitto and Florian Grosset for providing data replication services. We thank Uber for donating ride-sharing services, Alameda County for donating the influenza vaccinations and Dr. Michael and Denise Lenoir for subletting their clinic. The study was made possible by a grant from the Abdul Latif Jameel Poverty Action Lab - Health Care Delivery Initiative with supplemental support from NBER P30AG012810. The experiment is registered at clinicaltrials.gov (NCT03481270) and in the AEA RCT Registry (0002497). The authors declare they have no conflicts of interest. The views expressed herein are those of the authors and do not necessarily reflect the views of the National Bureau of Economic Research.
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