Find the full-text article for the following citation in the Emerald Full-Text database: Cassandra M. Scharber, Ann Melrose, Jody Wurl, (2009) "Online book clubs for preteens and teens", Library Review, Vol. 58 Iss: 3, pp.176 - 195
Upon reading the entire article, provide your understanding of:
1) The researcher's problem statement;
2) Any associated sub-problems;
3) The research hypothesis.
Provide a problem statement and hypothesis such as the researchers themselves may have formulated.