Definition: In this task, you're given two sentences. Indicate if the first sentence clearly entails the second sentence (i.e., one can conclude the 2nd sentence by reading the 1st one). Indicate your answer with '1' if the first sentence entails the second sentence, otherwise answer with '0'.
Input: Sentence 1: Seasonal affective disorder (SAD), a type of depression, is a debilitating problem that interferes with the quality of life of thousands of patients, especially during the fall, winter and early spring. This syndrome seems to be a worldwide phenomenon and occurs cross culturally, especially in countries far from the equator. Sentence 2: Seasonal affective disorder (SAD) is a worldwide disorder.

1