My DS 13 received 16 weekly LD (1/4 of HD) starting last November. It was extremely frustrating, because he would flare for 3-4 days, then start getting better, but would flare each time he had the treatment. In May of 2018 he had a HD. Huge improvement, which lasted about 6 weeks, then he began to decline. Had another HD two weeks ago. It was like magic. Immediate improvement. He will now receive monthly HD until the end of this year. Apparently, this is AE protocol. Could take 18 months. He is about 80% improved. His symptoms were severe.