description: |-
  Patient SSN (dutch: _BSN_). If not known or patient has no BSN, this value will be `0`.
  
  It is customary that BSNs are 9 digits; this API returns a number, i.e., no leading zeroes.
  API callers may want to transform this value into a string by explicitly left-padding `0`
  characters to the front to make the bsn value 9 digits.
type: integer
format: int32
minimum: 0
maximum: 999999999
example: 123456789