Complex sentence: World Health Organization, 1992 According DSM-IV-TR there are two main depressive symptoms--depressed mood, anhedonia, at least one of which must be present to determine diagnosis of major depressive episode.
Split into simpler sentences: World Health Organization, 1992 According to DSM-IV-TR, there are two main depressive symptoms--depressed mood and anhedonia. At least one of these must be present to make a diagnosis of major depressive episode.