Shellie and Greg Tucker, parents of Allison, center and Amelia, right, present their nine-month-old girls who were formerly conjoined twins at Children's Hospital of Philadelphia (CHOP) Thursday, Dec. 20, 2012, in Philadelphia. Dr. Scott Adzick, left, and Holly L. Hedrick, center back, looking on. Surgeons at CHOP separated the Tucker girls during a seven-hour operation in November. The infants from Adams, N.Y., had been joined at the lower chest and abdomen. They shared their chest wall, diaphragm, pericardium and liver. (AP Photo/Matt Rourke)

Associated Press
Shellie and Greg Tucker, parents of Allison, center and Amelia, right, present their nine-month-old girls who were formerly conjoined twins at Children's Hospital of Philadelphia (CHOP) Thursday, Dec. 20, 2012, in Philadelphia.  Dr. Scott Adzick, left, and  Holly L. Hedrick, center back, looking on. Surgeons at CHOP separated the Tucker girls during a seven-hour operation in November. The infants from Adams, N.Y., had been joined at the lower chest and abdomen. They shared their chest wall, diaphragm, pericardium and liver. (AP Photo/Matt Rourke)
Shellie and Greg Tucker, parents of Allison, center and Amelia, right, present their nine-month-old girls who were formerly conjoined twins at Children's Hospital of Philadelphia (CHOP) Thursday, Dec. 20, 2012, in Philadelphia. Dr. Scott Adzick, left, and Holly L. Hedrick, center back, looking on. Surgeons at CHOP separated the Tucker girls during a seven-hour operation in November. The infants from Adams, N.Y., had been joined at the lower chest and abdomen. They shared their chest wall, diaphragm, pericardium and liver. (AP Photo/Matt Rourke)
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