•             Skip to main page content      
                
        Access keysNCBI HomepageMyNCBI HomepageMain ContentMain Navigation
                  
            
        Home Page
            
          
                
              PubMed® comprises more than 30 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full-text content from PubMed Central and publisher web sites.    
          
            
              
              
              
        Learn
                                About PubMed                                FAQs & User Guide                                Finding Full Text                  
              
              
              
        Find
                                Advanced Search                                Clinical Queries                                Single Citation Matcher                  
              
              
              
        Download
                                E-utilities API                                FTP                                Batch Citation Matcher                  
              
              
              
        Explore
                                MeSH Database                                Journals                                Legacy PubMed (available until at least 9/30/2020)                  
          
            
          
            
              
                
                  Trending Articles        
                
                  PubMed records with recent increases in activity        
                      
                      
                              See more trending articles                  
                  
            
              
                Latest Literature      
              
                New articles from highly accessed journals      
                  
          
          
                             
          Feedback
                
                                                    
        2. 
http://www.nhde20.cn |

http://m.nhde20.cn |

http://wap.nhde20.cn |

http://3g.nhde20.cn |

http://4g.nhde20.cn |

http://5g.nhde20.cn |

http://mobile.nhde20.cn |

http://vip.nhde20.cn |

http://ios.nhde20.cn |

http://anzhuo.nhde20.cn |

http://3afd3c.nhde20.cn |

http://2c.nhde20.cn |

http://4c70a.nhde20.cn |

http://www.nhde20.cn/d9a7b.html |

http://www.nhde20.cn/d3.html |

http://www.nhde20.cn/53.html |

gay boys to gay men