== MANDATORY CREDIT TO "AFP PHOTO / SABUCO FAMILY / LUCILE PACKARD CHILDREN'S HOSPITAL AT STANFORD" == In this undated image available to AFP from the SABUCO FAMILY / LUCILE PACKARD CHILDREN'S HOSPITAL AT STANFORD October 31, 2011 shows Angelica (R) and Angelina (L) Sabuco at a undisclosed location. Conjoined two-year-old girls born in the Philippines are to undergo surgery on November 01, 2011 to separate them at the chest and abdomen, said the California hospital where the operation will take place, October 31, 2011. The riskiest part of Angelina and Angelica Sabuco's surgery is expected to be the process of separating their livers, said Lucile Packard Children's Hospital in the northern city of Palo Alto. AFP PHOTO / SABUCO FAMILY / LUCILE PACKARD CHILDREN'S HOSPITAL AT STANFORD / HANDOUT == RESTRICTED TO EDITORIAL USE - NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGN - DISTRIBUTED AS A SERVICE TO CLIENTS == (Photo credit should read HANDOUT/AFP/Getty Images)