Study: NCT00819065

Intervention type: DRUG
Group type: ACTIVE_COMPARATOR
Intervention: Botulinum toxin type A from laboratory Lanzhou
Description: Patients will receive botulinum toxin type A from laboratory Lanzhou either at time of allocation (arm BTA Lanzhou/Allergan) or three months later (arm BTA Allergan/Lanzhou), so that all patients will receive both drugs in a crossover model. Application will be performed according to standard protocol and respecting parameters of the patients former sessions (if there were any), by a trained investigator, unaware of the kind of TBA in use. Standard dilution will be employed, within the usual dose and application spots (for patients already in treatment) or standard (for patients yet to start treatment). Identical dose will be used, with 2ml of saline solution 0,9% dilution for each 100units, thus, there will be no difference for the patient or investigator concerning the applicated volume.

Intervention type: DRUG
Group type: ACTIVE_COMPARATOR
Intervention: Botulinum toxin type A from laboratory Lanzhou
Description: Patients will receive botulinum toxin type A from laboratory Lanzhou either at time of allocation (arm BTA Lanzhou/Allergan) or three months later (arm BTA Allergan/Lanzhou), so that all patients will receive both drugs in a crossover model. Application will be performed according to standard protocol and respecting parameters of the patients former sessions (if there were any), by a trained investigator, unaware of the kind of TBA in use. Standard dilution will be employed, within the usual dose and application spots (for patients already in treatment) or standard (for patients yet to start treatment). Identical dose will be used, with 2ml of saline solution 0,9% dilution for each 100units, thus, there will be no difference for the patient or investigator concerning the applicated volume.

Intervention type: DRUG
Group type: ACTIVE_COMPARATOR
Intervention: Botulinum toxin type A from laboratory Allergan
Description: Patients will receive botulinum toxin type A from laboratory Allergan either at time of allocation (arm BTA Allergan / Lanzhou) or three months later (arm BTA Lanzhou /Allergan), so that all patients will receive both drugs in a crossover model. Application will be performed according to standard protocol and respecting parameters of the patients former sessions (if there were any), by a trained investigator, unaware of the kind of BTA in use. Standard dilution will be employed, within the usual dose and application spots (for patients already in treatment) or standard (for patients yet to start treatment). Identical dose will be used, with 2ml of saline solution 0,9% dilution for each 100units, thus, there will be no difference for the patient or investigator concerning the applicated volume.

Intervention type: DRUG
Group type: ACTIVE_COMPARATOR
Intervention: Botulinum toxin type A from laboratory Allergan
Description: Patients will receive botulinum toxin type A from laboratory Allergan either at time of allocation (arm BTA Allergan / Lanzhou) or three months later (arm BTA Lanzhou /Allergan), so that all patients will receive both drugs in a crossover model. Application will be performed according to standard protocol and respecting parameters of the patients former sessions (if there were any), by a trained investigator, unaware of the kind of BTA in use. Standard dilution will be employed, within the usual dose and application spots (for patients already in treatment) or standard (for patients yet to start treatment). Identical dose will be used, with 2ml of saline solution 0,9% dilution for each 100units, thus, there will be no difference for the patient or investigator concerning the applicated volume.