function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Amon, Diva J & Ziegler, Amanda F & Kremenetskaia, Antonina', 2],
    ['Borges, Michela & Amaral, Antonia C. Z.', 1],
    ['Gerdes, Klaas & Kihara, Terue Cristina & Martinez Arbizu, Pedro', 1],
    ['Glover, Adrian G & Wiklund, Helena & Rabone, Muriel', 2],
    ['Goharimanesh, Mona & Stöhr, Sabine & Mirshamsi, Omid', 1],
    ['Granja-Fernández, Rebeca & Hendrickx, Michel E.', 3],
    ['O’Hara, Timothy D. & Thuy, Ben', 1],
    ['Stöhr, Sabine & Hugall, Andrew F. & Thuy, Ben', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=12)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 8, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);