I cannot create a summary of the requested article because it is not found in the search results provided. The searched articles in Slovak deal with clinical social work, sociotherapy and spirituality in health care, but not the article by Dr. Joseph Tucker on patient gratitude. In order to create an accurate and factual summary according to your requirements, I need access to the original article entitled "Opinion: I ask my patients what they're grateful for. Recently, three of them cried" or its Slovak translation.