Factors Associated With Syphilis Transmission and Acquisition Among Men Who Have Sex With Men: Protocol for a Multisite Egocentric Network Study oleh Casey E Copen, Julie Rushmore, Alex De Voux, Robert D Kirkcaldy, Yetunde F Fakile, Carla Tilchin, Jessica Duchen, Jacky M Jennings, Morgan Spahnie, Abigail Norris Turner, William C Miller, Richard M Novak, John A Schneider, Andrew B Trotter, Kyle T Bernstein