Author Contributions
The trial design was initiated by the authors from Penn State and finalized in collaboration with the Pfizer authors, as listed below. The contribution of each author is assigned by the following scale: Research project: 1A—Conception, 1B—Organization, 1C—Execution; Data and Statistical analysis: 2A:—Design, 2B—Execution, 2C—Review and critique; and Manuscript preparation: 3A—Writing the first draft, 3B Review and critique. The specific contributions were: M.M.L.: 1A, 1B, 1C, 2A, 2C, 3A, 3B; L.J.V.S.: 1A, 1B, 1C, 2A, 2B, 2C, 3A, 3B; S.D.J.: 1C, 2C, 3B; J.G.H.: 1B, 1C, 3B; P.J.E.: 1B, 1C; 3B; J.F.-M.: 1B; 3B; L.K.: 2A, 2B, 2C, 3B; Y.Y.: 2C, 3B; B.L.S.: 1B, 1C, 2B, 2C, 3B; N.L.: 1C; S.D.: 2A, 2C; D.L.G.: 1A, 2A, 2C, 3B; X.H.: 1A, 1B, 1C, 2A, 2C, 3A, 3B; R.B.M.: 1A, 1B, 2C, 3A, 3B. All authors have read and agreed to the published version of the manuscript.