IL13 and myalgic encephalomeyelitis/chronic fatigue syndrome: Post-hoc t-tests revealed prominent decreases in the levels of many pro- and anti-inflammatory cytokines in A-ME/CFS short-duration cases as compared with C-ME/CFS short-duration cases, including IL1β, IL5, IL7, IL13, IL17A, IFNα2, IFNγ, TNFα, TRAIL (TNFSF10), CCL2, CCL7, CXCL5, CXCL9, CSF3 (GCSF), βNGF, resistin and serpin E1 (PAI1).