Claims-Based Algorithm to Identify Pre-Exposure Prophylaxis Indications for Tenofovir Disoproxil Fumarate and Emtricitabine Prescriptions (2012-2014): Validation Study - Patrick Sean Sullivan; Robertino M Mera-Giler; Staci Bush; Valentina Shvachko; Eleanor Sarkodie; Daniel O'Farrell; Stephanie Dubose; David Magnuson (JMIR Formative Research, 2024)