LONDON (Reuters) - Oil prices slipped on Friday as Russia said it would need more time before committing to output cuts along with OPEC and other producers amid falling demand for crude as China battles the coronavirus epidemic. Brent crude futures fell 49 cents, or 0.9%, to $54.44 a barrel by 1305 GMT, and were heading for a fifth weekly loss due to persistent concerns over the impact of the virus.U.S. West Texas Intermediate (WTI) crude futures were down 53 cents, or 1%, at $50.42 a..