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Professors such as Claude S. Fischer and Eric Klinenberg opined in 2018 that while the data does n't support describing loneliness as an " epidemic " or even as a clearly growing problem , loneliness is indeed a serious issue , having a severe health impact on millions of people .
 person: Claude S. Fischer; person: Eric Klinenberg
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 person: Claude S. Fischer; person: Eric Klinenberg