Fig. 1: Trial design.
a, CONSORT diagram for the Thanksgiving campaign. b, CONSORT diagram for the Christmas campaign. ZCTA denotes zip code tabulation area (zip codes).
Fig. 1: Trial design. | Nature Medicine
a, CONSORT diagram for the Thanksgiving campaign. b, CONSORT diagram for the Christmas campaign. ZCTA denotes zip code tabulation area (zip codes).
