Umbilical Cord Mesenchymal Stem Cell for Aging-related Low-grade Inflammation

A total of 100 million single cells were suspended in 0.9% sterile saline solution and given intravenously at a 5-ml/min rate for 45 min. All patients will get two intravenous autologous infusions on days 0 (D0) and 90 (D90).