12192
The frequency of substance abuse had increased with respect to alcohol and cannabis ( during the period ) explained Lars Wichstroem a professor of child and adolescent psychology at the  Norwegian University of Science and Technology  in  Trondheim  .
 city of headquarters: Norwegian University of Science and Technology, Trondheim
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "relation1: word1, word2; relation2: word3, word4". 
Option: cities of residence, top members employees, members, alternate names, origin, state or provinces of residence, title of person, spouse, city of headquarters, NA, founded by, state or province of headquarters, employee of, countries of residence, country of birth, founded, subsidiaries, country of headquarters 
Text: {0} 
Answer:
 city of headquarters: Norwegian University of Science and Technology, Trondheim