[IlluminateDatabaseQueryException]
  SQLSTATE[HY000]: General error: 1005 Can't create table `consultorio`.`#sql-1e78_69` (errno: 150 "Foreign key const
  raint is incorrectly formed") (SQL: alter table `consultas` add constraint `consultas_id_doctors_foreign` foreign k
  ey (`id_doctors`) references `doctors` (`id`))

  [PDOException]
  SQLSTATE[HY000]: General error: 1005 Can't create table `consultorio`.`#sql-1e78_69` (errno: 150 "Foreign key const
  raint is incorrectly formed")

Schema::create('consultas', function (Blueprint $table) {
            $table->increments('id');
            $table->date('fecha');
            $table->string('patologia');

            $table->integer('id_doctors')->unsigned();
            $table->foreign('id_doctors')->references('id')->on('doctors');

            $table->integer('id_pacientes')->unsigned();
            $table->foreign('id_pacientes')->references('id')->on('pacientes');

            $table->timestamps();

        });