SEASONAL AND MONTHLY INCIDENCE OF PEPTIC ULCER.
D004381:Duodenal Ulcer; D004813:Epidemiology; D006801:Humans; D015994:Incidence; D010437:Peptic Ulcer; D012621:Seasons; D013276:Stomach Ulcer
DUODENAL ULCER; EPIDEMIOLOGY; SEASONS; STOMACH ULCER