Laboratory Measures as Proxies for Primary Care Encounters: Implications for Quantifying Clinical Retention Among HIV-Infected Adults in North America.
Rebeiro PF, Althoff KN, Lau B, Gill J, Abraham AG, Horberg MA, Kitahata MM, Yehia BR, Samji H, Brooks JT, Buchacz K, Napravnik S, Silverberg MJ, Rachlis A, Gebo KA, Sterling TR, Moore RD, Gange SJ. Laboratory Measures as Proxies for Primary Care Encounters: Implications for Quantifying Clinical Retention Among HIV-Infected Adults in North America. Am J Epidemiol. 2015 Dec 01; 182(11):952-60.