function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Ferro, Michael L.', 6],
    ['Gruppe, Axel & Aspöck, Ulrike', 2],
    ['Hassan, Muhammad Asghar & Oswald, John D. & Zia, Ahmed', 3],
    ['Kimmins, D. E.', 1],
    ['Sarmiento-Cordero, Mariza Araceli & Contreras-Ramos, Atilano', 2],
    ['Tillier, Pierre', 1],
    ['Zhao, Yaru & Badano, Davide & Liu, Zhiqi', 3]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=18)',
    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);