Use the Advanced Search. Follow the search below. Type MMWR (Morbidity & Mortality Weekly Report) as a SO SOURCE.
After the AND in the 2nd box type in the disease. Limit to the correct years, 2008-2013. Search.

I picked COPD. Here is one result.
Chronic obstructive pulmonary disease among adults - United States, 2011.(includes abstract); Centers for Disease Control and Prevention (CDC); MMWR: Morbidity & Mortality Weekly Report, 2012 Nov 23; 61: 938-43. (journal article) ISSN: 0149-2195 PMID: 23169314