2642273 ELFI Elderly Functional Index 4 2642270 ELFI early-life food insecurity 1 2642274 ELFI EAT-Lancet Consumption Frequency Index 1 2642275 ELFI Economical Leg Fluorescence Imaging 1 2642271 ELFI Electrochemical Lateral Flow Immunosensor 1 2642272 ELFI etoposide, leucovorin, 5-FU, and interferon alpha 2b 1