Some TSQL ....

Hello,

My appologies if i have double posted this question but i have yet to fully understand the "new experts exchange".

I have a select statement below that uses a table valued function "GetPersonInfo".

This function takes one parameter which is the patients personal number that can be found as m.pat_Personnummer or p.pat_Personnummer.


select
  m.msr_id as [Unikt ID],
  m.pat_id as [PatientID],
  convert( date, m.msr_date) as [Registeringsdatum],
  i.PO_CONGR as [Folkbokföring],
  'Vet ej' as [Vårdform],
  m.kli_kliniknr as [Enhetens ID],
  k.kli_Namn as [Enhetens namn],
  'Vet ej' as [Kommun],
  p.pat_Gender as [Kön],
  CASE WHEN ISDATE(SUBSTRING( m.pat_Personnummer, 1, 8 )) = 1 THEN
    floor( datediff( day, convert( datetime, SUBSTRING( m.pat_Personnummer, 1, 8 )), m.msr_date) / 365.25)
  ELSE NULL END  as [Ålder]
from  dbo.Measurements m
  INNER JOIN dbo.Kliniker k ON m.kli_Kliniknr = k.kli_KlinikNr
  INNER JOIN dbo.Patients p ON m.pat_id = p.pat_id,
  dbo.getPersonInfo( p.pat_Personnummer ) i


However no matter what syntax i try i always get:
Msg 4104, Level 16, State 1, Line 17
The multi-part identifier "p.pat_Personnummer" could not be bound.

How should i write this statement?