function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Hollier, John & Heads, Sam W.', 1],
    ['Pocco, Martina E. & Cigliano, María Marta', 1],
    ['Skejo, Josip & Rebrina, Fran & Szövényi, Gergely', 1],
    ['Song, Hojun', 2],
    ['Taylan, Mehmet Sait & Şirin, Deniz & Sevgili, Hasan', 1],
    ['Tlili, Haithem & Abdellaoui, Khemais', 1],
    ['Usmani, Mohammad Kamil', 2],
    ['Yong, Sheyla & Perez-Gelabert, Daniel E.', 4]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=13)',
    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);