"At the entrance right after valet parking, there is a step. While I was talking to the bellman, and moving back one step during the conversation, unfortunately my right leg landed on this uneven surface and immediately I felt pain at medial anterior aspect of my right knee. because I never thought it’s not flat surface. Later I found out, there is no any warning sign at eye level, just a yellow color tape on the step, however when you walk, you are not looking down and backwards, because you...