Personal ordinariate
If membership by reception of the sacraments of initiation within an ordinariate is open not only to the Catholics mentioned in the 2013 amendment but to others also who have no Anglican background - something on which no express statement has been issued - anyone who has not yet received all three sacraments of initiation may join. This includes non-Christians, those who, in the view of the Catholic Church, do not have valid baptism (such as Mormons), and those who, again in the view of the Catholic Church, have valid baptism but not valid confirmation or Eucharist. Protestants in general are seen as lacking valid confirmation, but the Eastern churches and some Western ones, such as some Old Catholic churches and the Polish National Catholic Church, are recognized as having valid sacraments.
Eastern Catholic Churches
The Holy See's "Annuario Pontificio" gives the following list of Eastern Catholic churches with the principal Episcopal See of each and the countries (or larger political areas) where they have ecclesiastical jurisdiction, to which are here added the date of union or foundation in parenthesis and the membership in brackets. The total membership for all Eastern Catholic Churches is at least 16,336,000 people. Eternal Word Television Network (EWTN) gives the same list, except that it does not place the liturgical traditions in the alphabetical order in which they are given by both the "Annuario Pontificio" and canon 28, and, as noted below, it treats the Apostolic Exarchate for Byzantine-Rite Catholics in the Czech Republic, which for the Holy See is part of the Ruthenian Catholic Church, as if it were a separate autonomous church.