NCCIH has been criticized by Steven E. Nissen, Stephen Barrett, and Kimball Atwood among others, for funding, along with the National Heart, Lung, and Blood Institute a study of EDTA chelation therapy for coronary artery disease, which lasted about 10 years and cost about $31 million, even though smaller, controlled trials found chelation ineffective. Other NCCIH-funded studies have included the benefits of distant prayer for AIDS, the effects of lemon and lavender essential oils on wound healing, "energy chelation", and "rats stressed out by white noise".