Very common (≥ 1/ 10); common (1≥ 100 to < 1/ 10); uncommon (≥ 1/ 1,000 to < 1/ 100); rare (≥ 1/ 10,000 to < 1/ 1,000), very rare (< 1/ 10,000), not known (cannot be estimated from the available data), since no valid estimate can be derived from clinical trials or epidemiological studies).