function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Campos, Maurício & Mothes, Beatriz & Eckert, Rafael', 1],
    ['Diaz, Maria Cristina & Nuttall, Marissa & Pomponi, Shirley A.', 2],
    ['Fassbender, Nico & Stefanoudis, Paris V', 2],
    ['Rocha, Lívia & Moraes, Fernando & Salani, Sula & Hajdu, Eduardo', 4],
    ['Rützler, Klaus & Piantoni, Carla & Van, Rob W. M.', 2],
    ['Topsent, Émile', 3],
    ['Ugalde, Diana & Fernandez, Julio C. C. & Gómez, Patricia', 1],
    ['Van Soest, Rob W. M.', 2],
    ['Van, Rob W. M.', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=19)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 9, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);