List the patient ids whose disease has the most occurrences.
patient ids refers to patients.patient; disease with the most occurrence refers to MAX(all_prevalences.OCCURENCES);
SELECT T1.patient FROM patients AS T1 INNER JOIN conditions AS T2 ON T1.patient = T2.PATIENT INNER JOIN all_prevalences AS T3 ON T3.ITEM = T2.DESCRIPTION ORDER BY T3.OCCURRENCES DESC LIMIT 1