AQP4 and neuromyelitis optica: Type and subfield location of lesions with AQP4 loss formed in Lewis rats after systemic injection of activated CNS antigen‐specific T cells and the murine monoclonal antibody E5415A (AQP4‐abs) or immunoglobulin preparations from five different AQP4‐antibody‐positive NMOSD patients (NMO‐IgGs 1–5).