“Vaginal Birth After Cesarean (VBAC) in a Pregnant Woman with Placenta Previa, Migraines, Neck & Back Pain Undergoing Subluxation Centered Chiropractic.” Well, that’s a mouthful…and the name of a study published in the Journal of Pediatric, Maternal & Family Health with David H. Spear, PhD, DC (aka Dr. David) as a principle author.