Chiropractors are best known for treating back and neck pain. Though it’s a controversial notion, some chiropractors are aggressively ＿＿（16）＿＿ themselves as holistic, primary-care healer who can treat a broad scope of ＿＿（17）＿＿ ranging from acid reflux to infertility. Others in the field say chiropractors should focus on musculoskeletal disorders such as back pain, ＿＿（18）＿＿ evidence for efficacy is the strongest. Though conventional practitioners have often scorned them ＿＿（19）＿＿ making unfounded claims, chiropractors are now ＿＿（20）＿＿ as mainstream health-care providers. Many health plans now cover their services, and they regularly care for clients ranging from the ＿＿（21）＿＿ ill to professional athletes. An estimated 8.6 percent of adults in the U.S. have used chiropractic or osteopathic manipulation, ＿＿（22）＿＿ the National Center for Complementary and Alternative Medicine. Chiropractors typically apply a sudden force to a region of the spine to help ＿＿（23）＿＿ a stiff joint, which they say allows the body’s natural healing process to take over. During an initial visit, the chiropractor typically takes a health history and ＿＿（24）＿＿ a physical exam, focusing on the spine. X-rays may be taken, and spinal adjustments may be applied ＿＿（25）＿＿ a patient lying face down or sideways on a table.