<qa>  What is a clinically significant or unstable medical or surgical condition that would preclude safe and- A clinically significant or unstable medical or surgical condition which would preclude safe and complete study participation. Such conditions may include cardiovascular, pulmonary, hepatic, renal, or metabolic diseases; or malignancies, as determined by medical history, physical exam, skin evaluation, laboratory tests, chest x-ray, or electrocardiogram ECG. 