SQL Server parameters

I want to use this SP with either having just 2 parameters like Patient Name, Patient LAst Namer or either Patient Name, Last Name, DOB or having the 4 all together.
Now, is working having mandatory all of 4, but the query would be having 2, 3 or 4.
What is the change that have to be done on this SP, thanks for your help.

ALTER PROCEDURE [dbo].[Get_Patients] 
	
	@PatientName varchar(50),
	@PatientLastName varchar(50),
	@PatientGender varchar(1),
	@PatientDOB date
	
AS
BEGIN
	
	SET NOCOUNT ON;

	select	PatientID as Id, PatientName AS [Name],PatientLastName as [Last Name],PatientGender as Gender ,PatientDOB as [Date of Birth]
	from	Patients
	where	
			
			PatientName			= @PatientName and
			PatientLastName		= @PatientLastName and
			PatientGender		= @PatientGender and 
			PatientDOB			= @PatientDOB 
	ORDER BY PatientID	
END

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