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"Retained surgical foreign bodies: a comprehensive review of risks and preventive strategies."
ncbi.nlm.nih.gov/pubmed/19447736
"Given the increasing complexity of both the modern health care environment and the overall patient population, reduction of medical errors is a high priority task for health policy makers and medical/surgical community alike."

"What surgeons leave behind costs some patients dearly"
usatoday.com/story/news/nation/2013/03/08/surgery-sponges-lost-supplies-patients-fatal-risk/1969603/
"More than a dozen times a day, doctors sew up patients with sponges and other supplies mistakenly left inside."

"More than a dozen times a day, doctors sew up patients with sponges and other supplies mistakenly left inside."
bigstory.ap.org/article/lawyer-surgeons-left-16-items-german-after-op
"A lawyer in Germany claims surgeons left up to 16 objects in her client's body after an operation for prostate cancer."

"Data Suggests Thousands of Surgical Instruments are Left Behind in Patients Each Year"
prweb.com/releases/2012/9/prweb9906776.htm
"Seattle medical malpractice attorney Chris Davis warns that surgical souvenirs are a shockingly common medical mistake."

"NHS blunders: Hundreds of patients have medical instruments left inside them or surgery on wrong body part"
mirror.co.uk/news/uk-news/nhs-blunders-hundreds-patients-medical-1879363
"In the last four years there were 322 cases of "foreign objects" left inside patients, and 214 had surgery on the wrong body part."