【正确答案】[范文]
   
Dear Sir,
   This is Zhou Li, a patient in your hospital. I'm writing to express my deepest gratitude to you all.
   First, I want to thank all the doctors who cured my disease and all the nurses who took care of me. With professional knowledge and great patience, you brought me the hope. Due to my poor economic condition, Shenhua Hospital offered me the treatment for free which made me moved greatly. And what's more, I also want to thank you for providing me much convenience and the subsequent consultation.
   In a word, it is Shenhua Hospital that gave me the second chance to live. Please accept my heartfelt thanks again.