Study protocol – Open Access Respiratory Research James E. Gern, Daniel J. Jackson, Robert F. LemanskeJr, Christine M. Seroogy, Umberto Tachinardi, Mark Craven, Stephen Y. Hwang, Carol M. Hamilton, Wayne Huggins, George T. O’Connor, Diane R. Gold, Rachel Miller, Meyer Kattan, Christine C. Johnson, Dennis Ownby, Edward M. Zoratti, Robert A. Wood, Cynthia M. Visness, Fernando Martinez, Anne Wright, Susan Lynch, Carole Ober, Gurjit K. Khurana Hershey, Patrick Ryan, Tina Hartert and Leonard B. Bacharier Respiratory Research 2019 20:115 Abstract Background Single birth cohort studies have been the basis for many discoveries about early life risk factors for childhood…