1. Available from: http://clinicaltrials.gov; Identifier: NCT00420420 (accessed 13.02.12)
2. Available from: http://clinicaltrials.gov; Identifier: NCT01540864 (accessed 13.02.12)
3. Available from: http://clinicaltrials.gov; Identifier: NCT00531752 (accessed 13.02.12)
4. Available from: http://clinicaltrials.gov; Identifier: NCT00366080 (accessed 13.02.12)
5. Histamine H3 receptor as a drug discovery target;Berlin;J. Med. Chem.,2011