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) Frequency not known (cannot be estimated from the available data)