8400
Sheehan ' s syndrome ( SS ) is characterized by various degrees of hypopituitarism , and develops as a result of ischemic pituitary necrosis due to severe postpartum hemorrhage .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None