The main outcome measures were lipopolysaccharide-stimulated production of proinflammatory cytokines interleukin-@ ( IL-@ ) , tumor necrosis factor alpha ( TNF - ) , and interleukin-@ ( IL-@ ) , and scores on the Multidimensional Fatigue Symptom Inventory-Short Form ( MFSI-SF ) , the vitality scale from the Medical Outcomes Study @-item Short Form ( SF-@ ) , and the Center for Epidemiological Studies-Depression ( CES-D ) scale .