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in 1997 - 98 , Dr. Marjo S. van der Knaap and colleagues saw the same characteristics in another set of patients , but these patients also expressed febrile infections .
 Marjo S. van der Knaap
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Marjo S. van der Knaap