A multi-level explanatory-sequential mixed-methods study of perinatal toxicology practices in New York State: Protocol. - Choi, Sugy; Knopf, Elizabeth; Kim, Erin; Neighbors, Charles J.; Berry, Carolyn A.; Hade, Erinn; Trinh-Shevrin, Chau; Terplan, Mishka; Seligman, Neil S.; Garry, David J.; McNeely, Jennifer (PLoS ONE, 2025)