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          comprehensive  
          
                                   
                 
                                      author：knowledge   
                                        
                                      
                                      Page View：25874
                                  
                                    
          
                                    
          Drs. Ben Carson, right, and Donlin Long with a brain model of the conjoined twins that were separated in a surgery performed at Johns Hopkins Hospital in September 1987. 																									Fred Kraft/AP
          Siamese twin separation that launched Ben Carson’s fame ended poorly for twins
                      
                              
          
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