The generated sql for my database has an error?

[Brian O'Brien]

I'm having difficulty getting my sql to execute properly... There is an error message being generated by mysql due to the sql I am trying to execute...

I think there is something wrong with a foreign key statement...
I wish I could attach my project files here...

Here is the sql..

SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0;
SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0;
SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='TRADITIONAL';

CREATE SCHEMA IF NOT EXISTS `BrainTumorDatabase` DEFAULT CHARACTER SET latin1 COLLATE latin1_swedish_ci ;
USE `BrainTumorDatabase`;

-- -----------------------------------------------------
-- Table `BrainTumorDatabase`.`PatientTable`
-- -----------------------------------------------------
DROP TABLE IF EXISTS `BrainTumorDatabase`.`PatientTable` ;

CREATE TABLE IF NOT EXISTS `BrainTumorDatabase`.`PatientTable` (
`FirstName` VARCHAR(32) NOT NULL ,
`MiddleName` VARCHAR(32) NULL ,
`LastName` VARCHAR(32) NOT NULL ,
`DateOfBirth` DATE NOT NULL ,
`Sex` CHAR NOT NULL ,
`PatientID` VARCHAR(32) NOT NULL ,
PRIMARY KEY (`PatientID`) )
ENGINE = InnoDB;


-- -----------------------------------------------------
-- Table `BrainTumorDatabase`.`SurgeryTable`
-- -----------------------------------------------------
DROP TABLE IF EXISTS `BrainTumorDatabase`.`SurgeryTable` ;

CREATE TABLE IF NOT EXISTS `BrainTumorDatabase`.`SurgeryTable` (
`Description` VARCHAR(128) NOT NULL ,
`DateOfSurgery` DATE NOT NULL ,
`SurgeryID` VARCHAR(45) NOT NULL ,
`PatientID` VARCHAR(32) NOT NULL ,
PRIMARY KEY (`SurgeryID`) ,
INDEX `PatientID` () ,
CONSTRAINT `PatientID`
FOREIGN KEY ()
REFERENCES `BrainTumorDatabase`.`PatientTable` ()
ON DELETE NO ACTION
ON UPDATE NO ACTION)
ENGINE = InnoDB;


This is generating an error message:

You have an error in your AQL syntax; check the manual that....
to use near '), CONSTRAINT `PatientID`
FOREIGN KEY()
REFRENCES `BrainTumorDatabase`.`Pati` at line 7


I designed a database with a few tables... the primary table is the PatientTable
subsequent tables have entries where the foreign key is the patientID...