Stomach disease utilizes a small flexible camera. The procedure does require intravenous sedation and takes about 30–45 minutes; the endoscope is inserted via the mouth and can visualize the entire swallowing tube, stomach and duodenum. The procedure also allows the physician to obtain biopsy samples. In many cases of bleeding, the surgeon can use the endoscope to treat the source of bleeding with laser, clips or other injectable drugs. Other radiological studies frequently used to assess patients with chronic stomach problems include a barium swallow, where a dye is consumed and pictures of the esophagus and stomach are obtained every few minutes.
The Trouble with Atheism matter of choosing something for which there is no scientific proof either way". He argues that adhering to both religious supernaturalism and scientific naturalism is not contradictory, but a "balance" of the "very essence of what it is to be human". Based on arguments for God such as the fine-tuned universe argument, and on a lack of a conclusive understanding of pre-Big Bang physics, Liddle states that "the true scientific position, of course, is that there may be a God, and there may not be a God". Liddle identifies this position as agnostic, which he distinguishes from the "zealous" atheism