| Stewart FH, Kaunitz AM, Laguardia KD, Karvois DL, Fisher AC, Friedman AJ June 2005 | Ortho-McNeil Pharmaceutical September 20, 2006 |
|---|---|
| Cole JA, Norman H, Doherty M, Walker AM February 2007 | Sibai BM, Odlind V, Meador ML, Shangold GA, Fisher AC, Creasy GW 2002 |
| Zieman M, Guillebaud J, Weisberg E, Shangold GA, Fisher AC, Creasy GW GW 2002 | ; Trussell, James; Nelson, Anita L |
|---|---|
| Contraceptive Technology, Chapter 12, Contraceptive Patch and Vaginal Contraceptive Ring, by Kavita Nanda, page 272• Rivera R, Yacobson I, Grimes D 1999 |