1. Department of Obstetrics & Gynecology Oregon Health & Science University Portland Oregon USA
2. Health Research Consortium (CISIDAT) Cuernavaca Mexico
3. Independent Consultant Mexico City Mexico
4. Department of Obstetrics & Gynecology Oregon Health & Science University, OHSU‐Portland State University School of Public Health Portland Oregon USA
5. National Institute of Public Health (INSP) Center for Population Health Research (CISP) Cuernavaca Mexico