Tue, 27 Oct 2009
                                                                    
                                                                      Answered on 
                                                                
                                                                    
                                                                    Tue, 27 Oct 2009
                                                                    
                                                                      Last reviewed on   
                                                                I have heard that the effect lasts for 6 months, and the second dose can be taken after six months.
                    
                                    
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