title: The elusive minimum threshold concentration of levonorgestrel for contraceptive efficacy.
authors.affiliation: CONRAD, Eastern Virginia Medical School, Arlington, VA, USA. Electronic address: gcherala@conrad.org.
authors.forename: Ganesh
authors.initials: G
authors.lastname: Cherala
authors.affiliation: Oregon Health & Science University, Portland, OR, USA. Electronic address: edelmana@ohsu.edu.
authors.forename: Alison
authors.initials: A
authors.lastname: Edelman
authors.affiliation: FHI 360, Durham, NC, USA. Electronic address: LDorflinger@fhi360.org.
authors.forename: Laneta
authors.initials: L
authors.lastname: Dorflinger
authors.affiliation: University of Southern California, Los Angeles, CA, USA. Electronic address: fstanczyk@att.net.
authors.forename: Frank Z
authors.initials: FZ
authors.lastname: Stanczyk
mesh_terms: D003271:Contraceptive Agents, Female / Q000097:blood* / Q000627:therapeutic use; D005260:Female; D006801:Humans; D016912:Levonorgestrel / Q000097:blood* / Q000627:therapeutic use; D016896:Treatment Outcome
chemical_list: D003271:Contraceptive Agents, Female; D016912:Levonorgestrel