function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Ludwig, Hubert', 1],
    ['Martins, Luciana & Marques, Alexandre Oliveira', 1],
    ['Martins, Luciana & Souto, Camilla', 2],
    ['O’Loughlin, Mark & Manjón-Cabeza, Eugenia & Ruiz, Francina Moya', 1],
    ['Prata, Jéssica & Manso, Cynthia Lara De Castro', 1],
    ['Thandar, Ahmed S.', 1],
    ['Théel, Hjalmar', 13]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=20)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 7, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);