function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Arroyo, Yessenia & Hajdu, Eduardo & Willenz, Philippe', 2],
    ['Calcinai, Barbara & Belfiore, Giuseppe & Pica, Daniela', 2],
    ['Carvalho, Mariana De S. & Carraro, João L. & Lerner, Cléa', 2],
    ['Gutekunst, V. & Müller, A. U. & Pohl, T. & Brümmer, F.', 1],
    ['Sim-Smith, Carina & Hickman, Cleveland & Kelly, Michelle', 1],
    ['Topsent, Émile', 1],
    ['Van, Rob W. M.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=10)',
    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);